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HTML-PRETTY(1)		    General Commands Manual		HTML-PRETTY(1)

NAME
       html-pretty - prettyprint HTML and SGML files

SYNOPSIS
       html-pretty [ -?	 ] [ -author ] [ -blank-line-warning ]
		   [ -brief ] [	-catalogfile filename ]
		   [ -check-tag-nesting	] [ -comment-banner ]
		   [ -convert-paragraph-breaks ]
		   [ -copyright	] [ -email-address user@hostname ]
		   [ -extend-style 'style: TAG TAG ...'	 ]
		   [ -extend-style 'TAG: TAG TAG ...'  ]
		   [ -file filename ] [	-grammar-level grammar ]
		   [ -help ] [ -indent nnn ] [ -keep-format ]
		   [ -logfile filename ] [ -no-blank-line-warning ]
		   [ -no-brief ] [ -no-check-tag-nesting ]
		   [ -no-comment-banner	]
		   [ -no-convert-paragraph-breaks ]
		   [ -no-keep-format ] [ -no-print-stylefile ]
		   [ -no-quiet ] [ -no-read-stylefiles ]
		   [ -no-trace-opens ] [ -no-unknown-tag-warning ]
		   [ -no-warnings-in-comments ]
		   [ -outfile filename ] [ -personal-name name ]
		   [ -print-stylefile ]	[ -quiet ]
		   [ -read-stylefiles ]	[ -stylefile filename ]
		   [ -trace-opens ] [ -unknown-tag-warning ]
		   [ -version ]	[ -warnings-in-comments	]
		   [ -width nnn	]
		   [ < infile or file(s) ] [ > outfile ]

DESCRIPTION
       html-pretty  filters  its HTML or SGML input from stdin,	or from	one or
       more named files	given on the command line, and prettyprints it to std-
       out, standardizing the spacing, and providing indentation to expose the
       document	structure.

       When its	input is just a	plain text file	in the	ASCII  or  ISO	8859-1
       character  sets,	 a  major  part	of the conversion of text to grammati-
       cally-correct HTML can be done automatically, especially	if  the	 -con-
       vert-paragraph-breaks  option is	used.  Section headings, verbatim, and
       tabular material	will, however, require manual editing.

       HTML (HyperText Markup Language)	is the language	used to	 specify  for-
       matting instructions in text files intended for viewing with World-Wide
       Web (WWW) client	 programs  (browsers),	such  as  amaya(1),  arena(1),
       chimera(1),   grail(1),	 hotjava(1),   jde(1),	lynx(1),  netscape(1),
       panorama(1), and	xmosaic(1).

       The WWW idea began in late 1992,	and because  viewer  programs  support
       display	of  text, line drawings, color raster images, hypertext	links,
       and uniform access to several Internet services,	including file	trans-
       fer,  in	 the first two years, the number of WWW	servers	grew from zero
       to several hundred thousand, and	some of	the more popular sites receive
       up  to  twenty-five  million accesses a day from	all over the Internet.
       Consequently, many Internet computer users are beginning	to write  HTML
       documents  for  their  own  home	 pages,	and html-pretty	is written for
       them.

       The goal	of a prettyprinter is to recognize all legal inputs, and  pro-
       duce  output  that  is  indented	to reflect the structure, and in which
       line lengths have been restricted for improved readability.  Irregular-
       ities  in  coding  practice, and	outright errors, are more likely to be
       detected	in the prettyprinted output, than in the input.

       SGML (Standard General Markup Language, ISO 8879), and  its  particular
       document	 type definition instance, HTML, follow	a rigorous grammar for
       text markup that	makes it possible to clearly identify document	parts,
       such  as	 headings, sections, subsections, paragraphs, figures, tables,
       equations, and so on, and files with such standardized markup are  par-
       ticularly good candidates for prettyprinting.

       The  definition	of HTML	is still evolving.  Version 2.0	(Fall 1994) is
       implemented by almost all browsers.   Version  3.0,  informally	called
       HTML  Plus, was introduced in March, 1995, and the arena(1) browser was
       developed at the	World-Wide Web Consortium, W3C,	to serve as a  testbed
       for it.

       Although	Version	3.0 is a superset of version 2.0, it proved too	diffi-
       cult for	browser	implementors to	incorporate support for	it in  a  rea-
       sonable	time, and it was withdrawn in Fall, 1996.  Version 3.2 was re-
       leased on 14 January 1997, but despite its higher  version  number,  it
       lacks  many  of the new features	introduced in version 3.0, notably for
       mathematical markup, but	importantly, it	does include support for  fig-
       ures and	tables.	 As with version 3.0, there is also a testbed browser,
       this time called	amaya(1), and augmented	with the ability to edit  HTML
       files,  providing  a (simple-minded) WYSIWYG editor interface that some
       users may find convenient for creating and maintaining HTML files.

       At the time of writing in Fall, 1997, only the amaya(1) and netscape(1)
       browsers	appear to have implemented all,	or most, of HTML 3.2.

       Further information about HTML versions 3.0 and 3.2 can be found	on the
       World-Wide Web at the Uniform Resource Locators (URLs)

	      http://www.w3.org/MarkUp/Wilbur/
	      http://www.w3.org/TR/REC-html32.html

       The next	version	of HTML, code-named Cougar, is under development,  and
       will  become  version 4.0 when it is finally released.  The first draft
       public release was on 8 July 1997, and a	second proposed	recommendation
       followed	on 7 November 1997.  For details, visit	URLs

	      http://www.w3.org/MarkUp/Cougar/
	      http://www.w3.org/TR/WD-html40/
	      http://www.w3.org/TR/PR-html40/

       Interestingly,  translations  of	 the  version  4.0 specification to at
       least 18	other human languages are in progress: see URLs

	      http://www.w3.org/TR/WD-html40/translations.html
	      http://www.w3.org/TR/PR-html40-971107/translations.html

       html-pretty recognizes all HTML tags in the grammars of	versions  1.0,
       2.0, 3.0, 3.2, and proposed 4.0,	plus a few vendor-specific extensions.

       One  significant	 difference  between  the grammar versions is that the
       HTML tag	_P_ is a paragraph separator in	version	2.0,  while  it	 is  a
       paragraph  begin	 in later versions, and	consequently expects to	have a
       matching	_/P_ paragraph end tag that is not  required  in  2.0.	 html-
       pretty will supply missing _/P_ tags, and delete	empty _P_ ... _/P_ en-
       vironments.  Since HTML translators ignore unknown tags,	this is	trans-
       parent to HTML version 2.0 implementations, and causes no problems.

       html-pretty  expects  that its input is reasonably well-formed. Usually
       it is sufficient	that the file can be displayed	by  one	 or  more  WWW
       browsers,  producing the	expected form.	However, it would be unwise to
       write a large amount of program code without a compiler	to  check  it,
       and it is similarly unwise to write documentation in HTML or SGML with-
       out at least a validating parser	to ensure that the text	 is  syntacti-
       cally correct.

       Fortunately,  at	least two such programs	are publicly available (thanks
       to  the	generosity  of	their  author,	James  Clark),	nsgmls(1)  and
       sgmls(1),  together  with  UNIX	shell scripts, html-check(1) and html-
       ncheck(1), to facilitate	their use with HTML files.  In	addition,  the
       nsgmls(1)  distribution	is  accompanied	 by  two SGML tag normalizers,
       sgmlnorm(1) and spam(1),	and  there  is	a  UNIX	 shell	script,	 html-
       spam(1),	 for  one  of them.  You may therefore find it useful to apply
       html-spam(1), and either	html-check(1) or html-ncheck(1), to your  HTML
       files, and fix all of the errors	that they detect, before filtering the
       files with html-pretty.

       HTML strictly requires a	certain	amount of boiler-plate to  be  wrapped
       around  the text, and there is ample evidence that most HTML files omit
       these wrappers, because WWW browsers are	 written  to  be  tolerant  of
       grammatical  deviations.	  html-pretty will supply the wrappers if they
       are omitted; indeed, if given an	empty input file, html-pretty produces
       output similar to this:

	      <!-- -*-html-*- -->
	      <!-- Prettyprinted by html-pretty	flex version 1.00 [11-Nov-1997]	-->
	      <!-- on Tue Nov 11 16:23:39 1997 -->
	      <!-- for Nelson H. F. Beebe (beebe@plot79.math.utah.edu) -->

	      <!DOCTYPE	HTML PUBLIC "-//IETF//DTD HTML//EN">

	      <HTML>
		  <HEAD>
		      <TITLE>
			  <!-- Please supply a descriptive title here -->
		      </TITLE>
		      <!-- Please supply a correct e-mail address here -->
		      <LINK REV="made" HREF="mailto:beebe@plot79.math.utah.edu">
		  </HEAD>
		  <BODY>
		  </BODY>
	      </HTML>

       This example, minus the comments	<!-- ... -->, shows the	minimal	markup
       that should be expected in an HTML file,	although the  grammar  permits
       the  HTML,  HEAD	and BODY environments to be implicitly assumed if they
       are omitted.  While most	WWW browsers ignore the	 DOCTYPE  declaration,
       it is essential for SGML	parsers, since it identifies the grammar rules
       that apply to what follows.  Two	 recent	 WWW  browsers,	 amaya(1)  and
       panorama(1),  are  SGML-grammar	based, and may require a valid DOCTYPE
       declaration.

OPTIONS
       Command-line options affect all following filenames.  Option values are
       always  provided	as separate arguments following	the option name.  Let-
       ter case	in option names	is not significant, although it	may be in  op-
       tion  values.   Option  names  may be abbreviated to any	unique leading
       prefix, unless a	shorter	prefix is documented.

       Any argument that begins	with a hyphen is expected to be	an option, and
       will raise an error if it is not	recognized.  If	a filename begins with
       a hyphen, you therefore need to disguise	it by supplying	a leading  di-
       rectory	path.	For  example, ./-foo represents	the file named -foo in
       the current directory in	UNIX.

       GNU- and	POSIX-style options of the form	--name	are  also  recognized:
       they begin with two option prefix characters.

       For  every option -xxx that sets	a Boolean flag to be acted upon	later,
       there is	a corresponding	-no-xxx	option to override it.	 The  negative
       forms  are  normally  not required, but are necessary to	counteract op-
       tions set in a style file.

       -author		Show author information	on stderr and quit after  pro-
			cessing	 any  remaining	command-line options that pre-
			cede the next command-line HTML	file.

       -blank-line-warning
			Unlike most word processing and	 typesetting  systems,
			and ordinary typewritten text, in HTML and SGML, blank
			lines do not imply a paragraph break, except in	verba-
			tim  environments.   You can select this option	to get
			warnings about such blank lines.  They will be reduced
			to a single blank line,	leaving	space for later	manual
			insertion of a <P> tag,	if that	was  indeed  what  was
			intended [default: -no-blank-line-warning].

			If  you	 specify the -convert-paragraph-breaks option,
			then this option will have no effect.

       -brief		Brief mode: exclude the	standard boiler-plate  wrapper
			of  !DOCTYPE, HTML, HEAD, and BODY tags	[default: -no-
			brief].

			This option, in	conjunction  with  -no-comment-banner,
			is  convenient	for  prettyprinting small fragments of
			text, such as from inside a text editor.  It can  also
			be  used for portions of larger	documents (e.g., chap-
			ters of	a book)	that are not  in  themselves  complete
			HTML files.

			This option can	be abbreviated to -b.

       -catalogfile filename
			Specify	 an alternate catalog file to override the de-
			fault one.  See	the CATALOG DIRECTORY section for more
			details.

			This option can	be abbreviated to -c.

       -check-tag-nesting
			Use  built-in  tables,	or tables from style files, of
			tag-is-contained-in and	 tag-cannot-contain  relations
			to  check  that	 tags  are properly nested.  The rules
			that govern this are very complex, and depend  on  the
			grammar	 level chosen. The precise relations are tabu-
			lated in the HTML GRAMMAR CONSTRAINTS section, and the
			way  they  are provided	to html-pretty is described in
			the STYLE FILES	section.

			Because	this option can	lead  to  a  large  number  of
			warning	 messages  when	optional end tags are omitted,
			the default is -no-check-tag-nesting.

			Nevertheless, when a proper SGML parser, such as html-
			check(1) or html-ncheck(1), is not available, this op-
			tion can be very helpful in diagnosing errors  of  tag
			usage.

       -comment-banner	Generate a leading comment banner containing the pret-
			typrinter version number and date,  the	 current  date
			and  time,  and	the personal name and email address of
			the user who ran the prettyprinter [default: -comment-
			banner].

       -convert-paragraph-breaks
			Convert	 paragraph  breaks  (sequences	of one or more
			blank or empty lines) to HTML <P> tags [default:  -no-
			convert-paragraph-breaks].

			This  option  is intended for converting text files to
			HTML; it should	not be used when the input file	is al-
			ready  HTML, unless the	intent really is to insert ex-
			plicit paragraph tags.

			This option has	no effect on blank lines inside	verba-
			tim environments.

       -copyright

       -copyleft	Show  copyright	 information  on stderr	and quit after
			processing any	remaining  command-line	 options  that
			precede	the next command-line HTML file.

       -email-address user@hostname
			Supply an alternate electronic mail address to be used
			in the comment banner and the LINK tag.	 Otherwise,  a
			default	 address  is constructed from the current user
			name and host name, when that information is available
			from the operating system.

			This option may	also be	spelled	-e-mail-address, since
			both e-mail and	email are about	equally	common	abbre-
			viations on the	World-Wide Web.

       -extend-style 'style: TAG TAG ...'

       -extend-style 'TAG: TAG TAG ...'
			These  options,	 whose name can	be abbreviated to just
			-e, provide a quick command-line  alternative  to  the
			style  file  feature  of  the -stylefile option.  They
			permit you to augment the list of tags associated with
			a  particular formatting style class, or to add	a list
			of tags	to the same class as an	existing tag (to avoid
			the  need to know the style class names), but only for
			the duration of	the current process.

			Since a	tag can	belong to only a single	style class at
			one  time,  specification  of existing tags with these
			options	effectively removes their old style class  as-
			sociation.

			html-pretty  distinguishes  between  the  two cases by
			looking	up the first name in its tag table.  If	it  is
			entirely  in  uppercase, then it might be found	there.
			Otherwise, it is a style class name.

			If the style class is not recognized, an error message
			is  issued  with a list	of the recognized class	names,
			and execution is terminated after processing  any  re-
			maining	 command-line  options	that  precede the next
			command-line HTML file.	 Thus, an option -extend-style
			foo:bar'  or -extend-style help=me' with obviously in-
			correct	class and tag names can	be used	to coax	a list
			of  the	 valid	ones from html-pretty; it will respond
			with something like this:

			       :1:unknown style	[foo] command [BAR] at line 0
			       in style	source [command-line]

			       The recognized style classes are:
				       body doctype font head html
				       line-break link list list-header
				       list-item markup-declaration math
				       math-pair pair paragraph	plaintext
				       public section short standalone
				       standalone-nocheck title	verbatim

			The output line	width in this list is governed by  the
			-width option.

			You  can  assign  tags to the special style class name
			default	to make	them unknown (and also,	warned	about,
			if  you	supply the -unknown-tag-warning	option), e.g.,
			default:blink.

			Because	some operating systems do not  allow  embedded
			spaces in command-line arguments, you can separate the
			tags in	the value  string  with	 a  comma  instead  of
			whitespace.   Also, you	can use	an equals sign instead
			of a colon after the first  word.   For	 example,  the
			value strings

			       font:A,MEDIUM
			       font=A,MEDIUM
			       'font   =   A	MEDIUM'
			       'font :	   A,,,,MEDIUM'

			all  assign tags A and MEDIUM to the font style	class.
			Incidentally, some people prefer A (anchor) tag	 pairs
			to  be	treated	this way, rather than their default of
			being placed on	separate lines,	even though  long  hy-
			pertext	 references  in	<A HREF="..."> make this style
			hard to	read.

			For more information on	 this  topic,  see  the	 STYLE
			FILES section below.

       -file filename	Supply an alternate input filename for use in the out-
			put comment banner.  This overrides the	 actual	 file-
			name(s),  and  provides	a way to name the output, even
			when no	named input file is available,	because	 stan-
			dard input is redirected, or comes from	a pipe.

       -grammar-level grammar
			Select	a  grammar  level  that	 in turn will select a
			suitable style file.  See the  CATALOG	DIRECTORY  and
			STYLE FILES sections for more details.

			Lettercase is not significant in grammar-level names.

			You  can  use this option, together with the -unknown-
			tag-warning option, to help detect use	of  HTML  tags
			that  are not part of the grammar.  However, a better,
			and grammatically rigorous, way	to do this is to use a
			validating  SGML  parser, such as those	accessible via
			the html-check(1) and html-ncheck(1) scripts.

			The built-in default grammar level is a	union  of  the
			HTML  grammar  levels 1.0, 2.0,	3.0, 3.2, and proposed
			4.0, plus selected browser-vendor extensions.

			A properly-installed html-pretty  always  supports  at
			least grammar levels 1.0, 2.0, 3.0, 3.2, 4.0, plus one
			named all which	contains a union of all	of the grammar
			styles in the catalog directory.  This will be similar
			to the built-in	default	style, but may differ from  it
			in  minor  details,  since it is easier	to augment the
			style file than	it is to  rebuild  and	reinstall  the
			software.

			There is also a	`grammar level'	named dtd; it augments
			the normal style rules with additional ones for	 extra
			declarations  and tags found in	SGML and HTML Document
			Type Definition	(DTD) files.

			If you specify an incorrect grammar level, html-pretty
			will  display  a message showing the available levels,
			and then quit:

			       html-pretty -g foo
			       :1:could	not find grammar level [foo] in
			       catalog file [/usr/local/share/lib/html-pretty/catalog]:
				   levels available:  all dtd 2	2.0 3 3.0 3.2 4	4.0

			If the style file has a	public style class entry,  the
			output DOCTYPE declaration will	use its	value, instead
			of a built-in default; see the STYLE FILES section be-
			low for	details.

			Tip:  if  you  want to find out	the differences	in the
			sets of	HTML tags accepted by  two  different  grammar
			versions,  use	this  option with the -print-stylefile
			and -width options like	this:

			       html-pretty -w 0	-g 3.2 -p >foo.3.2
			       html-pretty -w 0	-g 4.0 -p >foo.4.0
			       diff foo.3.2 foo.4.0

			The difference listing	will  show  just  those	 style
			classes	 where	the tag	lists differ, since each class
			will be	complete on one	(possibly long)	line.

       -help or	-?	Display	brief usage information	on stderr and quit af-
			ter processing any remaining command-line options that
			precede	the next command-line HTML file.

       -indent nnn	Set the	number of spaces for  each  indentation	 level
			[default: 4].

       -keep-format	Treat  the  input stream as verbatim text whose	visual
			format is to be	exactly	preserved.  It	will  be  con-
			verted to the body of a	preformatted HTML environment,
			<PRE> ... </PRE>, and all characters  will  be	output
			unchanged,  except  for	 the four characters `<', `>',
			`&', and `"', which will be translated to  SGML	 enti-
			ties  `&lt;',  `&gt;', `&amp;',	and either `&quot;' or
			`&34;' (depending on the grammar level), respectively.

			This option is useful for converting non-HTML text  to
			HTML when the linebreaking and indentation are already
			decided, such as preformatted tables, samples of  com-
			puter  program	input and output, and programming lan-
			guage fragments.

			Horizontal tab characters are treated like  spaces  in
			HTML, but most Web browsers will display text contain-
			ing tabs as if each tab	caused blank fill up  to,  and
			including,  the	 next  column  which  is a multiple of
			eight, which is	the conventional behavior on many sys-
			tems.  The visual appearance is	correct	if the text is
			displayed with a  fixed-width  font,  but  is  usually
			wrong with a proportionally-spaced font.

			However,  when	asked  to save the file	as plain text,
			some browsers will save	text  with  tabs,  and	others
			will  save  text with tabs expanded to spaces, thereby
			preserving the original	 appearance.   When  the  same
			text  is  cut  with  the mouse and pasted into another
			window,	some browsers preserve tabs, and  others  con-
			vert  it  to  spaces.	And  even  more	confusingly, a
			browser	that converts tabs to spaces in	a  saved  file
			may leave tabs intact in cut-and-pasted	text!

			In  most cases,	tabs are not significant, but they are
			for UNIX Makefiles, so if your	text  has  significant
			tabs,  you should incorporate a	warning	that they will
			likely be destroyed by the Web browser,	and will  need
			to be restored manually, or with a pass	through	a fil-
			ter such as unexpand(1).

			html-pretty always treats tabs as ordinary characters,
			but  if	you want to be sure of correct display of tabs
			according to the  conventional	blank-fill  rule,  you
			should filter the input	to html-pretty using a tab ex-
			pander such as expand(1).

			For Fortran code containing tab	characters, the	 mean-
			ing  of	tabs is	context	sensitive, and you need	to use
			a Fortran-tab aware converter.	There is  no  standard
			UNIX utility to	do this, although a local emacs(1) ed-
			itor function M-x detab-fortran	will do	the job.

       -logfile	filename
			Redirect warning and error messages from stderr	to the
			indicated  filename.  This option is provided for user
			convenience  on	 poorly-designed   operating   systems
			(e.g.,	IBM PC DOS) that fail to provide for redirect-
			ion of stderr to a specified file.

			This option can	also be	used for discarding  messages,
			with, e.g., on UNIX systems, -logfile /dev/null.

			If  the	 file cannot be	opened for output, html-pretty
			will terminate silently	with a non-zero	exit code, be-
			cause  the internal attempted redirection required the
			closure	of stderr, making it unavailable for  printing
			further	error messages.

       -no-blank-line-warning
			Override  an  earlier -blank-line-warning option.  Un-
			like most word processing and typesetting systems, and
			ordinary  typewritten  text,  in  HTML and SGML, blank
			lines do not imply a paragraph break, except in	verba-
			tim environments.  html-pretty will therefore normally
			silently reduce	such blank lines  to  a	 single	 space
			[default: -no-blank-line-warning].

			If  you	 specify the -convert-paragraph-breaks option,
			then this option will have no effect.

       -no-brief	Override an earlier -brief option, so that  the	 stan-
			dard  wrapper  !DOCTYPE, HTML, HEAD, and BODY tags are
			generated  [default: -no-brief].

       -no-check-tag-nesting
			Suppress checks	for correct tag	nesting	[default: -no-
			check-tag-nesting].

       -no-comment-banner
			Suppress  generation  of  the  default leading comment
			banner.

			This option can	be abbreviated to -n, since it may  be
			used frequently	[default: -comment-banner].

       -no-convert-paragraph-breaks
			Do  not	 convert paragraph breaks (sequences of	one or
			more blank or empty lines) to HTML <P> tags  [default:
			-no-convert-paragraph-breaks].	 Instead,  unless  the
			-blank-line-warning option has been given,  the	 empty
			lines will be reduced to a single space.

       -no-keep-format	Override an earlier -keep-format option, and thus per-
			mit reformatting of the	input  stream  [default:  -no-
			keep-format ].

       -no-print-stylefile
			Override   an  earlier	-print-stylefile  option,  and
			therefore, do not terminate execution before  process-
			ing style files	[default: -no-print-stylefile].

       -no-quiet	Override  an  earlier -quiet option, to	restore	output
			of warning messages on stderr [default:	-no-quiet].

       -no-read-stylefiles
			Suppress reading of the	three default style files (see
			the  STYLE FILES section below)	[default: -read-style-
			files].

			Style files implicitly specified  with	-grammar-level
			options,  or  explicitly specified with	-stylefile op-
			tions, will still be processed.

       -no-trace-opens	Override an earlier -trace-opens option, so that  file
			opening	 attempts  are	not traced on stderr [default:
			-no-trace-opens].

       -no-unknown-tag-warning
			Override an earlier  -unknown-tag-warning  option,  so
			that  unknown HTML tags	will not elicit	a warning mes-
			sage [default: -no-unknown-tag-warning].

       -no-warnings-in-comments
			Override an earlier -warnings-in-comments  option,  so
			that  warning  and  error messages are written only to
			stderr (which might  have  been	 redirected  with  the
			-logfile option) [default: -no-warnings-in-comments].

       -outfile	filename
			Redirect output	from stdout to the indicated filename.
			This option is provided	for user convenience on	 oper-
			ating  systems that fail to provide for	redirection of
			stdout to a specified file.

       -personal-name name
			Supply an alternate personal name string to be used in
			the  comment  banner.	Normally, the personal name is
			determined via the current user	name, when that	infor-
			mation is available from the operating system.

       -print-stylefile	Print a	style file on stdout and quit after processing
			any remaining command-line options  that  precede  the
			next command-line HTML file.

			This option can	be abbreviated to -p.

			The output line	width in the style file	is governed by
			the -width option described later.

			Startup	option files, and any preceding	-extend-style,
			-grammar-level,	 and  -stylefile  options will already
			have been processed, and their	changes	 will  be  re-
			flected	in the output produced by this option.

			Use this option	to find	out how	each recognized	tag is
			processed, and also to get a template style file  that
			you  can  customize.   The  style  class names and tag
			lists are ordered alphabetically  for  improved	 read-
			ability.   For	more details, see the STYLE FILES sec-
			tion below.

       -quiet		Suppress output	of warning messages on stderr.	 Error
			messages will, however,	not be suppressed.

			If you really want to discard error messages too, then
			use the	-logfile /dev/null option instead.

       -read-stylefiles	Override an  earlier  -no-read-stylefiles  option,  so
			that  the  three  standard  style files	(see the STYLE
			FILES section below) are read  [default:  -read-style-
			files].

       -stylefile filename
			Name  a	style file (see	the STYLE FILES	section	below)
			to augment html-pretty's built-in  knowledge  of  HTML
			tags.	This  option  may  be given more than once, if
			multiple initialization	files are needed.

       -trace-opens	Trace all file-opening attempts, with a	one-line  mes-
			sage on	stderr for each	[default: -no-trace-opens].

			This  option  can  be helpful in analyzing file	access
			failures, and in uncovering the	 location  of  default
			style files and	the catalog directory.

       -unknown-tag-warning
			Unknown	HTML tags are always treated as	ordinary text,
			but with this option, you can request that  a  warning
			be  raised for each of them [default: -no-unknown-tag-
			warning].

			While this option is not a substitute for a validating
			HTML  parser, such as html-check(1) or html-ncheck(1),
			it does	provide	a simple way to	catch use of non-stan-
			dard  tags.  See the -extend-style option for a	way to
			catch specific tags.

       -version		Show version information on stderr and quit after pro-
			cessing	 any  remaining	command-line options that pre-
			cede the next command-line HTML	file.

       -warnings-in-comments
			Write warning and error	messages  as  easily-identifi-
			able  single-line  HTML	 comments  on stdout [default:
			-no-warnings-in-comments].  This may  facilitate  cor-
			rection	of problems in the output file,	since the mes-
			sages can be located by	context, rather	than  by  line
			number in the input file.

			Messages  are  always written to stderr	as well	(which
			might have been	redirected with	the  -logfile  option,
			or suppressed with the -quiet option).

       -width nnn	Set the	maximum	output line width [default: 72].  This
			limit may be exceeded if an  excessively  long	string
			without	 embedded spaces is encountered, and it	is ig-
			nored completely inside	preformatted or	verbatim text.

			If you set the line width to 0,	it will	be treated  as
			`infinite'  (i.e., the largest representable integer).
			If you set it to a very	small value, e.g., 1, then the
			output	will have one word per line, which might actu-
			ally be	useful on occasion!

			This option can	be abbreviated to -w.

FORMATTING CONVENTIONS
       html-pretty groups HTML tags into collections of	style  classes.	  Tags
       within  a  single style class receive similar formatting.  The built-in
       style-class tag-membership lists	recognize a large collection  of  tags
       from  multiple  grammar levels, and multiple browser vendor extensions,
       but all of the built-in lists can be modified by	the user, as described
       in  the -extend-style and -stylefile options above, and the STYLE FILES
       section below.

       The subsections which follow catalog  the  origins  of  the  recognized
       tags, and then describe the available style classes in alphabetical or-
       der, listing their default tag members, and briefly sketching  how  the
       tags are	formatted.

       Tags  that  are	not explicitly named in	these subsections, or in style
       files that are read at run time,	are treated as normal text,  and  have
       no effect on the	indentation or line breaking, other than their contri-
       bution toward the line length limit.

       Tags in the style classes doctype, line-break, math, plaintext,	short,
       standalone,  and	 standalone-nocheck  make up the set of	HTML tags with
       SGML content EMPTY, which means that end	tags for them  are  forbidden.
       html-pretty  will  issue	 warnings  about such end tags,	but will leave
       their deletion to a human.

   Recognized HTML Tags
       HTML 2.0	contains the following 49 tags:	A, ADDRESS,  B,	 BASE,	BLOCK-
       QUOTE, BODY, BR,	CITE, CODE, DD,	DIR, DL, DT, EM, FORM, H1, H2, H3, H4,
       H5, H6, HEAD, HR, HTML, I, IMG, INPUT, ISINDEX, KBD, LI,	LINK, LISTING,
       MENU,  META,  NEXTID,  OL,  OPTION,  P,	PLAINTEXT,  PRE, SAMP, SELECT,
       STRONG, TEXTAREA, TITLE,	TT, UL,	VAR, and XMP.

       HTML 3.0	augments the 2.0 grammar  with	53  additional	tags:  ABBREV,
       ABOVE, ACRONYM, ARRAY, ATOP, AU,	BAR, BELOW, BIG, BOX, BQ, BT, CAPTION,
       CHOOSE, CREDIT, DDOT, DEL, DFN, DIV, DOT, FIG, HAT,  INS,  ITEM,	 LANG,
       LEFT,  LH,  MATH, NOTE, OF, OVER, OVERLAY, PERSON, PRE, Q, RIGHT, ROOT,
       ROW, S, SMALL, SQRT, STYLE, SUB,	SUP, T,	TAB, TABLE, TD,	TH, TILDE, TR,
       U, and VEC.

       These  tags  are	 identified  by	 their	occurrence in the html.dtd and
       html-3.dtd document type	definition files in lines like these:

	      <!ENTITY % font "	TT | B | I ">
	      <!ENTITY % phrase	"EM | STRONG | CODE | SAMP | KBD | VAR | CITE ">
	      <!ELEMENT	(%font;|%phrase) - - (%text)+>
	      <!ELEMENT	XMP - -	 %literal>

       ENTITY declarations define text string substitutions, and ELEMENT  dec-
       larations define	the tags recognized by the grammar.

       HTML  3.2  introduced  these  21	new tags: APPLET, AREA,	BASEFONT, BIG,
       CAPTION,	CENTER,	DFN, DIV, FILE,	 FONT,	MAP,  NUMBER,  PARAM,  SCRIPT,
       SMALL, STRIKE, STYLE, SUB, SUP, TABLE, and U.

       Proposed	 HTML 4.0 introduces these 15 new tags:	BDO, BUTTON, COL, COL-
       GROUP, FIELDSET,	FRAMESET, IFRAME, LABEL, NOFRAMES,  NOSCRIPT,  OBJECT,
       SPAN, TBODY, TFOOT, and THEAD.

   HTML	Tag Omission
       The HTML	grammar	permits	certain	end tags to be omitted,	when their im-
       plied position can be determined	from the grammatical context.  In HTML
       3.0,  this  includes  the following tags: DD, DT, ITEM, LH, LI, OF, OP-
       TION, P,	ROW, STYLE, and	TR.

       The HTML	3.2 grammar permits these end tags to be omitted: DD, DT,  IN-
       PUT, LI,	OPTION,	and P.

       The  HTML  proposed  4.0	 grammars permit these end tags	to be omitted:
       COLGROUP, DD, DT, LI, OPTION, P,	PARAM, TFOOT, THEAD, and TR.

       In all grammar versions,	these tags never have end  tags:  AREA,	 BASE,
       BR,  FRAME,  HR,	 IMG,  INPUT,  ISINDEX,	LINK, META, NEXTID, PARAM, and
       PLAINTEXT.

       In version 3.0, BASEFONT	takes an optional end tag, but	in  succeeding
       versions, it must not have an end tag.

       In version 3.0, STYLE takes an optional end tag,	but in succeeding ver-
       sions, it must have an end tag.

       Supporting the tag-omission feature requires the	 ability  to  parse  a
       complete	SGML grammar, which requires a great deal more code than html-
       pretty provides.	 Consequently, html-pretty does	not  support  optional
       end  tags;  based  on  typical  usage,  they  are expected to be	always
       present,	or always absent, according to the rules given below.  Omitted
       end  tags can be	automatically supplied by an SGML tag normalizer, such
       as sgmlnorm(1), spam(1),	or html-spam(1).

       html-pretty will	warn about end tags that should	not be present,	 based
       on  the	tags'  membership in those style classes that are known	not to
       have end	tags.  However,	it  will  not  delete  them  from  the	output
       stream, because human judgment may be called for.  See the HTML GRAMMAR
       CONSTRAINTS section below for further details.

   Style Class:	body
       The following HTML tag name must	occur  only  once,  with  a  begin/end
       pair,  often  with  substantial amounts of intervening text: BODY.  The
       begin/end tags are prettyprinted	on separate lines, with	their enclosed
       text  indented one level.  However, the BODY environment	must occur af-
       ter the HEAD environment, and one level inside  the  HTML  environment.
       html-pretty  will  supply this environment if needed, unless the	-brief
       option has suppressed it.

   Style Class:	comment
       Short HTML comments are output inline, like normal  text.   Long	 ones,
       and  ones  with	embedded angle brackets, are prettyprinted on separate
       lines.  Their internal form is  preserved  exactly,  without  any  line
       wrapping,  since	 they will often contain specially-formatted material.
       Any whitespace between the final	"--" and  the  closing	angle  bracket
       will be eliminated, when	possible.

   Style Class:	doctype
       The  following  HTML  tag name occurs only once,	and should normally be
       the first non-comment tag in a file: !DOCTYPE.  html-pretty will	supply
       this  tag  if  needed,  unless  the  -brief  option  has	suppressed it.
       Strictly, this is not a tag, but	rather a markup	declaration, but html-
       pretty treats it	as a special tag, and outputs it verbatim while	check-
       ing for proper embedded comment balance.	 For  more  details,  see  the
       COMMENTS	IN HTML	AND SGML section below.

   Style Class:	font
       These  HTML  tag	 names	occur in begin/end pairs, usually with smaller
       amounts of enclosed material.  They appear inline in the	running	 text,
       and  do	not  alter indentation:	ACRONYM, B, BIG, BLINK,	BT, CODE, DFN,
       EM, I, KBD, Q, REV, S, SAMP, SMALL, STRIKE, STRONG, T, TT, U, and VAR.

   Style Class:	head
       This HTML tag occurs in begin/end pairs,	 which	are  prettyprinted  on
       separate	 lines with enclosing text indented one	level: HEAD.  However,
       this tag	pair must occur	only once in a file, and then only  inside  an
       HTML  environment,  and	before the BODY	environment.  html-pretty will
       supply this environment if needed, unless the -brief  option  has  sup-
       pressed it.

   Style Class:	html
       This  HTML  tag	occurs	in begin/end pairs, which are prettyprinted on
       separate	lines with enclosing text indented one level: HTML.   However,
       this tag	pair must occur	only once in a file, and then only at the out-
       ermost level.  html-pretty will supply this environment if needed,  un-
       less the	-brief option has suppressed it.

   Style Class:	inline
       Tags  in	 this  class  are treated as ordinary text, with no additional
       spacing requirements, or	checks for enclosing environments.

       Neither the default built-in style, nor any of  the  standard  grammar-
       level-specific  style  files, use this class.  It is provided to	permit
       transparent handling of tags that may be	added in  future  versions  of
       the HTML	grammars.

       There  is  a difference in the handling of a member of this class, com-
       pared to	that for a tag which is	not defined in any class.  The	latter
       may  result in warnings if the -unknown-tag-warning option has been se-
       lected, is allowed only in the BODY environment,	and may	cause a	 para-
       graph  to end.  A tag in	the inline style class may occur in either the
       HEAD or BODY environments, never	raises unknown-tag warnings, and  does
       not end a paragraph.

   Style Class:	line-break
       This  HTML  tag	marks  an explicit line	break, and has no matching end
       tag; preceding space is deleted,	and a newline follows: BR.

   Style Class:	link
       This HTML tag has no matching end tag; it appears alone on  a  separate
       line: LINK.  There is normally at least one LINK	tag, in	the HEAD envi-
       ronment,	and html-pretty	will  supply  one  automatically  if  none  is
       present in the input stream.

   Style Class:	list
       These  HTML  tags  names	 occur	in begin/end pairs, and	delimit	lists.
       They appear on separate lines, with their enclosed  text	 indented  two
       levels: DIR, DL,	MENU, OL, and UL.

   Style Class:	list-header
       This  HTML  tag	marks the title	of a list: LH.	The begin/end tags are
       output on separate lines, indented one level from the enclosing list.

   Style Class:	list-item
       These HTML tags mark the	beginning of list items, and have matching end
       tags  which  are	supplied if they are absent.  They are output on sepa-
       rate lines, indented one	level from the enclosing list: DD, DT, and LI.

   Style Class:	markup-declaration
       The following SGML markup declarations are also	treated	 like  special
       tags,  and  output  verbatim while checking for proper embedded comment
       balance:	!ATTLIST, !ELEMENT, !ENTITY, !NOTATION,	!SGML, !SHORTREF,  and
       !USEMAP.	  However,  html-pretty	 does  no further checking about where
       these `tags' are	legal.	Generally, they	do not occur  in  HTML	files,
       but are found mainly in DTD files.

   Style Class:	math
       These  HTML  tag	names occur only inside	a MATH environment, and	appear
       inline, without end tags,  and  without	affecting  indentation:	 ATOP,
       CHOOSE, LEFT, OF, OVER, RIGHT, and TAB.

   Style Class:	math-pair
       These  HTML  tag	 names	occur only inside a MATH environment, with be-
       gin/end pairs, and appear inline, without affecting indentation:	ABOVE,
       BAR,  BELOW, BOX, DDOT, DOT, HAT, ROOT, ROW, SQRT, SUB, SUP, TILDE, and
       VEC.

   Style Class:	pair
       The following HTML tag names occur in begin/end pairs (_TAG_and_/TAG_),
       often  with  substantial	 amounts  of  intervening text:	A, ABBREV, AB-
       STRACT, ADDED, ADDRESS, APPLET, ARG, AROW, ARRAY, AU, BDO,  BLOCKQUOTE,
       BQ,  BUTTON,  CAPTION,  CENTER,	CITE, CMD, COLGROUP, CREDIT, DEL, DIV,
       DIV1, DIV2, DIV3, DIV4, DIV5, DIV6, FIELDSET, FIG, FN, FONT,  FOOTNOTE,
       FORM, FRAMESET, HIDE, IFRAME, INS, LABEL, LANG, MAP, MARGIN, MATH, MES-
       SAGE, NOFRAMES, NOSCRIPT, NOTE, OBJECT, OPTION, PERSON, QUOTE, REMOVED,
       SELECT,	SPAN, STYLE, TABLE, TBODY, TD, TEXTAREA, TFOOT,	TH, THEAD, and
       TR.  They are prettyprinted on separate lines, with their enclosed text
       indented	one level.

   Style Class:	paragraph
       This  HTML  tag	occurs	in begin/end pairs, which are prettyprinted on
       separate	lines with enclosing text indented  one	 level:	 P.   However,
       paragraphing  is	 tracked, empty	paragraphs are discarded, and when new
       tags are	encountered which are known to be illegal inside a  paragraph,
       any open	paragraph is automatically closed.  Thus, old-style HTML files
       with omitted </P> tags will usually get them added.  Unlike  most  word
       processors  and	many  typesetting systems, blank lines in the SGML and
       HTML input stream do not	imply a	paragraph  break;  only	 the  _P_  tag
       does.

   Style Class:	plaintext
       The  HTML  tag PLAINTEXT	marks the beginning of verbatim	text that con-
       tinues to end-of-file; it appears on a separate	line.	Although  some
       HTML  viewers  will  terminate  the plaintext environment on reaching a
       matching	end tag, _/PLAINTEXT_, that practice is	now  considered	 erro-
       neous.

       html-pretty  will  warn	about this abberant environment, and recommend
       using _PRE_ ... _/PRE_ instead.

   Style Class:	section
       These HTML tags occur in	begin/end pairs, which	are  prettyprinted  on
       separate	 lines with enclosing text indented one	level: H1, H2, H3, H4,
       H5, and H6.  However, they must be logically ordered: H1	before H2  ...
       before  H6,  with  no intermediate header levels	omitted, and they must
       appear at the first level inside	the BODY environment.

   Style Class:	short
       This HTML tag has no matching end tag; it appears alone on  a  separate
       line: ITEM.  However, tags in this class	can be used only inside	a BODY
       environment, and	consequently, html-pretty will automatically  end  any
       open HEAD environment, and start	a BODY environment, if needed.

   Style Class:	standalone
       These HTML tags have no matching	end tag; they appear alone on separate
       lines: CHANGED, HR, IMG,	INPUT, RENDER, STYLES, and WBR.	 However, they
       may  appear  only inside	the BODY environment, and outside a paragraph,
       and consequently, html-pretty will automatically	end any	open HEAD  and
       P environments, and start a BODY	environment, if	needed.

   Style Class:	standalone-nocheck
       These HTML tags have no matching	end tag; they may appear in either the
       HEAD or the BODY	environment, and they appear alone on separate	lines:
       BASE, ISINDEX, META, and	NEXTID.

       As  the	class  name  implies,  they are	not checked against rules that
       might restrict their placement with respect to other environments.

   Style Class:	title
       This HTML tag occurs in begin/end pairs,	 which	are  prettyprinted  on
       separate	lines with enclosing text indented one level: TITLE.  However,
       this tag	pair is	restricted to occurring	only in	the HEAD  environment,
       and  should  normally only be given once.  html-pretty will supply this
       environment if needed, unless the -brief	option has suppressed it,  and
       will warn about multiple	occurrences.

   Style Class:	verbatim
       These  HTML  tags  appear  in begin/end pairs, delimit preformatted, or
       verbatim, text, and may occur only in the  BODY	environment:  LISTING,
       NOBR,  PRE, and XMP.  The beginning and ending tags are output on sepa-
       rate lines, with	no indentation,	and with the enclosed material	copied
       exactly as it appeared in the input stream.

   Style Class:	verbatim-nocheck
       These  HTML  tags  appear  in begin/end pairs, delimit preformatted, or
       verbatim, text, and may occur in	 either	 HEAD  or  BODY	 environments:
       SCRIPT and STYLE.  The beginning	and ending tags	are output on separate
       lines, with no indentation, and with the	enclosed material  copied  ex-
       actly as	it appeared in the input stream.

       The  SCRIPT  and	 STYLE environments are	not strictly verbatim environ-
       ments, but since	they contain material  in  one	of  several  different
       scripting  (Java,  JavaScript, Tcl, VBScript, ...) or style-sheet (CSS,
       ...)  languages,	there is no reasonable way for html-pretty to reformat
       their  contents,	 so  they  are included	in this	style class to prevent
       such reformatting.

STYLE FILES
       In order	to allow the user to control the formatting of particular HTML
       tags,  html-pretty  supports  a	powerful  style	 file  mechanism.   At
       startup,	it processes a style file in  the  directory  where  the  exe-
       cutable	program	 was found, a second style file	in the user's home di-
       rectory,	and a third style file in  the	current	 directory.   None  of
       these need exist.  Next,	during command-line argument processing, addi-
       tional style files can be provided with the -stylefile  option.	 These
       style files support system-specific, user-specific, directory-specific,
       and job-	or file-specific prettyprinting	control.

       The default name	of the first three style files	is  system  dependent:
       .html-prettyrc  (UNIX),	htmlpty.ini  (IBM PC DOS), and html-pretty.ini
       (DEC VMS	and OpenVMS).  The exact names depend on the name of the  exe-
       cutable	program,  which	is used	to construct the style file names.  If
       you renamed it to sgmlpretty.exe, the names would be  .sgmlprettyrc  on
       UNIX, and sgmlpretty.ini	on other systems.

       More precisely, the program name	passed to the prettyprinter as its ze-
       roth argument is	filtered by discarding any trailing version number and
       extension,  then	keeping	the last consecutive string of characters that
       are letters, digits, hyphens, or	underscores.  If the  zeroth  argument
       is  empty,  implying  that  the	program	name is	unknown, then the name
       htmlpty is used;	it is short enough to be acceptable to any  reasonable
       file system.

       Automatic  association  of  the	style file names with the program name
       makes it	easy to	 support  multiple  versions,  e.g.,  html-pretty-2-0,
       html-pretty-3-0,	html-pretty-3-2, and html-pretty-4-0 could select dif-
       ferent HTML grammar versions, and on UNIX, and a	 few  other  operating
       systems,	 those	programs could all be links to the same	physical file,
       avoiding	wasteful duplication of	disk space.

       In the current implementation of	html-pretty, all of the	standard  HTML
       tags  defined in	HTML grammar levels up to the proposed 4.0, plus a few
       browser vendor extensions, are hard-coded into the program  as  members
       of  over	 twenty	 formatting-style  classes,  so	that no	external style
       files need exist	for the	program	to run.	 However,  the	-extend-style,
       -grammar-level,	and  -stylefile	options	allow the built-in rules to be
       completely replaced, if desired.

       The -print-stylefile command displays the built-in style	rules as a set
       of  style class names, each followed by a colon and a list of HTML tags
       in that style class.  Its output	may be used without further  modifica-
       tion as a style file, and looks something like this:

	      %% html-pretty version 1.00 date [29-Nov-1997]
	      %% User-modifiable style file generated on Wed Dec  3 08:34:39 1997

	      %% Uncomment the next line to clear all existing rules,
	      %% or leave it as	a comment to preserve them:
	      %	default	:

	      body :			BODY

	      doctype :			!DOCTYPE

	      font :			ACRONYM	B BIG BLINK BT CODE \
					DFN EM I KBD Q REV S SAMP \
					SMALL STRIKE STRONG T TT U \
					VAR

	      head :			HEAD

	      html :			HTML

	      inline :

	      line-break :		BR

	      link :			LINK

	      list :			DIR DL MENU OL UL

	      list-header :		LH

	      list-item	:		DD DT LI

	      markup-declaration :	!ATTLIST !ELEMENT !ENTITY \
					!NOTATION !SGML	!SHORTREF \
					!USEMAP

	      math :			ATOP CHOOSE LEFT OF OVER \
					RIGHT TAB

	      math-pair	:		ABOVE BAR BELOW	BOX DDOT \
					DOT HAT	ROOT ROW SQRT SUB \
					SUP TILDE VEC

	      pair :			A ABBREV ABSTRACT ADDED	\
					ADDRESS	APPLET ARG AROW	\
					ARRAY AU BDO BLOCKQUOTE	BQ \
					BUTTON CAPTION CENTER CITE \
					CMD COLGROUP CREDIT DEL	DIV \
					DIV1 DIV2 DIV3 DIV4 DIV5 \
					DIV6 FIELDSET FIG FN FONT \
					FOOTNOTE FORM FRAMESET HIDE \
					IFRAME INS LABEL LANG MAP \
					MARGIN MATH MESSAGE \
					NOFRAMES NOSCRIPT NOTE \
					OBJECT OPTION PERSON QUOTE \
					REMOVED	SELECT SPAN TABLE \
					TBODY TD TEXTAREA TFOOT	TH \
					THEAD TR

	      paragraph	:		P

	      plaintext	:		PLAINTEXT

	      public :			"-//IETF//DTD HTML//EN"

	      section :			H1 H2 H3 H4 H5 H6

	      short :			ITEM

	      standalone :		CHANGED	HR IMG INPUT RENDER \
					STYLES WBR

	      standalone-nocheck :	AREA BASE BASEFONT COL \
					FRAME ISINDEX META NEXTID \
					OVERLAY	PARAM

	      title :			TITLE

	      verbatim :		LISTING	NOBR PRE XMP

	      verbatim-nocheck :	SCRIPT STYLE

       There will be additional	data at	the end	of this	output,	in the form of
       the tag relationships discussed below, but we omit it here  because  of
       its length.

       Notice that long	lines can be continued on multiple physical lines, for
       improved	readability, by	terminating them with a	backslash  immediately
       before  the newline.  The output	line width in this file	is governed by
       the -width option.

       As with the command-line	-extend-style  option,	you  can  replace  the
       colon  with  an equal sign, and the spaces between tags with commas, if
       you prefer.

       In addition to the style	classes	listed above, the special style	 class
       default	can be used to force an	HTML tag to revert to the default rule
       for unknown tags: just treat it as ordinary text, although if the  -un-
       known-tag-warning  option  was  specified, a warning will be issued for
       this now	unknown	tag.  You can use this to override earlier style  file
       settings, and most of the built-in ones.

       The  special  style  class  public  is associated with the SGML DOCTYPE
       identifier string, rather than with a list of HTML tags.	  That	string
       determines  which  grammar file is to be	used for the document, and the
       value above corresponds to the most generic grammar level (2.0)	recog-
       nized  by almost	all browsers, even though the style file includes tags
       from higher grammar levels.  The	public style class is the  only	 class
       whose value is a	quoted string.

       If  the	tag  list to the right of the colon (or	equals sign) is	empty,
       then all	existing tags for that class are forgotten.  If	an  empty  tag
       list  is	 used  with  the  default  style  class, then all tags for all
       classes are forgotten.  These two  uses	allow  you  to	eliminate  all
       built-in	 rules,	or just	certain	style classes, so that your style file
       can start from a	known rule base.

       Style class names are case sensitive, and all of	the ones recognized by
       html-pretty must	be spelled with	lowercase letters.

       The style file is expected to contain lines of the forms:

	      style-class : TAG1 TAG2 ...

	      TAG : TAG1 TAG2 ...

	      relationship[TAG]	: TAG1 TAG2 ...

	      -option
	      -option -option ...
	      -option value
	      -option value -option value  ...

       In  the	second form, the style class of	the first tag is looked	up and
       assigned	to the remaining tags.	That first tag must be entirely	UPPER-
       CASE  in	order to distinguish it	from a style class.  The remaining tag
       names can be in either lettercase, or in	mixed case; they will be  con-
       verted to uppercase internally.

       The  third form specifies a relationship	between	a tag, and one or more
       other tags.  The	two currently-recognized relationships are ContainedIn
       and  CannotContain;  any	 others	 that are specified will simply	be ig-
       nored, although they will take up memory	space.	For example, the lines

	      CannotContain[TITLE]	: LINK META SCRIPT STYLE
	      ContainedIn[LH]		: DL OL	UL

       mean that a TITLE environment cannot contain  LINK,  META,  SCRIPT,  or
       STYLE tags, and that an LH tag can only be contained in a DL, OL, or UL
       environment.   Unlike style class definitions,  relationships  are  not
       cumulative; only	the last one of	each relationship type encountered for
       a particular tag	will be	used.

       Because of the complexity of SGML grammars, tag relationships cannot be
       reliably	determined manually.  Instead, relationship tables are derived
       from the	grammar	files by software developed especially	for,  and  in-
       cluded  with,  the html-pretty distribution, and	then inserted into the
       standard	style files.  Thus, it is not anticipated that users will pro-
       vide tag	relationship data in their personal style files, although they
       are free	to do so.

       The built-in relationship tables	are derived from a merger of the major
       grammar	levels,	so that	they match tags	in the built-in	style classes,
       which are also derived from that	merger.

       Tag relationships are only checked when the  -check-tag-nesting	option
       is  specified, and since	that is	not a default option, omitting tag re-
       lationships will	normally not have a visible effect on  the  output  of
       html-pretty.

       In  the	remaining  forms,  command-line	options	appear,	and any	of the
       documented options may be used this way.	 You can use this facility  to
       collect	preferred  option settings in one place, such as in directory-
       or user-specific	initialization files.  Observe that a  -stylefile  op-
       tion  here  can	be used	to chain temporarily to	another	file, and this
       can go on recursively to	a depth	which is limited only by the  run-time
       stack depth and the maximum number of simultaneously open files.

       Blank  lines,  leading and trailing whitespace, and text	from a percent
       (%) comment character to	end of line, are ignored.  To  get  a  literal
       percent or quotation mark into a	value, prefix it with a	backslash; the
       backslash will be removed when the value	is collected.

       Whitespace separates items, and can be omitted around the colon.	 There
       is  no  significance  to	 the order of items on a line, or lines	in the
       file, except that later settings	can override earlier ones.   The  same
       style class name	may occur on multiple lines, and the tag lists will be
       accumulated, discarding duplicates.

       The line	length limit in	style files is system-dependent,  but  guaran-
       teed to be at least 2048	characters.

       Here is an example of a small style file	to add the new tags introduced
       in the HTML proposed 4.0	grammar	(even though they are actually already
       present in the built-in rules):

	      %	HTML proposed 4.0 additions
	      font : Acronym s

	      pair : BdO Button	col colgroup Fieldset FrameSet IFrame \
		     laBel NoFrames NoScript Object span TBody TFoot thEAD

	      public : "-//W3C//DTD HTML 4.0 Transitional//EN"

       The last	style class attached to	command	or environment name is the one
       that is used, so	specifications in command-line	-extend-style,	-gram-
       mar-level,  or -stylefile options can override those in the current di-
       rectory style file, those in turn override settings from	the  home  di-
       rectory style file, and those override system-wide style	file settings.

CATALOG	DIRECTORY
       The  built-in  style  rules in html-pretty, together with the three de-
       fault startup style files, and the  -extend-style  class:  taglist  and
       -stylefile  stylefile  options suffice for most uses of the prettyprin-
       ter.

       However,	it may be useful to offer a simpler interface  that  only  re-
       quires the user to specify the desired grammar level with the -grammar-
       level grammar option, and have html-pretty automatically	find the style
       files.  Thus, when the -grammar-level option is used, html-pretty looks
       for a catalog directory that contains a file named catalog, and one  or
       more style files.

       The  catalog  directory	is  searched  for in the same path as the exe-
       cutable file, but in a path starting one	level higher.  On UNIX,	it  is
       usually	called	share/lib/_programname_,  so if	the executable program
       was  /usr/local/bin/html-pretty,	 the  catalog  directory  is  /usr/lo-
       cal/share/lib/html-pretty.   [Conventionally, on	UNIX systems, directo-
       ries in the share directory tree	are shared  across  multiple  O/S  re-
       leases and vendor architectures.]

       On  other operating systems, the	share portion of the path may be omit-
       ted.  However, the quickest way to find out where the catalog directory
       resides	on  your  system is to run html-pretty with the	-grammar-level
       and -trace-opens	options, to trace the file-opening attempts.

       The catalog file	has a simple format: each non-empty  line  contains  a
       grammar level, and a corresponding filename in that directory.  As with
       style files, comments run from percent (%) to end-of-line, but there is
       no  support  for	line continuation, since the lines are all very	short.
       To get a	literal	percent	or quotation mark into a value,	prefix it with
       a backslash; the	backslash will be removed when the value is collected.

       This  indirect  mapping	of  grammar level to style file	means that end
       users need not know the style file names, and thus, that	the names  can
       be changed to meet local	requirements.

       SGML  parsers and other SGML software use a similar catalog file	to map
       DTD descriptor strings to local filenames.

       Lettercase is not significant in	grammar-level names, although  it  may
       be  for	filenames.  The	standard style files are all named in a	single
       lettercase, so that the catalog entries work on all file	systems.

       If you are developing a new set of styles, you  probably	 do  not  want
       them put	in the system-wide catalog directory until they	have been com-
       pleted and debugged. In such a case, you	can use	the  -catalogfile  op-
       tion  to	 specify  an  alternate	 catalog file location.	 Once they are
       ready for wider release,	you (or	your system manager)  can  merge  your
       catalog	file  with  the	system one, and	copy your style	files into the
       system catalog directory.

COMMENTS IN HTML AND SGML
       The SGML	(and thus, HTML) comment syntax	confuses many users, including
       browser programmers, and	book writers, who either get it	wrong, or fail
       to explain it properly.

       SGML has	a command called markup	declaration open, or  mdo  for	short,
       which  defaults	to  the	two-character sequence _!, and is matched by a
       markup declaration close, or mdc, which defaults	to  the	 one-character
       sequence	 _.  The mdo must be immediately followed either by a keyword,
       such as ATTLIST,	DOCTYPE, ELEMENT, ENTITY, NOTATION, SGML, SHORTREF, or
       USEMAP, or else by a comment start, which is the	two-character sequence
       --.  In the latter case,	there must later be a second --	pair to	signal
       a  comment end.	Anything after that second pair	is non-comment text to
       be parsed.  However, additional comments	can appear, provided that they
       are surrounded by -- pairs. Eventually, the markup declaration is ended
       by an mdc command, although whitespace may  follow  the	last  comment.
       Thus,

	      <!--one--	--two--	--three-->
	      <!-- one -- -- two -- -- three --	>
	      <!-- one --
		-- two --
		-- three --
	      >

       are all legal markup declarations, each of which	consists of three com-
       ments. However, these are in error:

	      <! --one-- --two-- --three-- >
	      <!-- one -- two -- three -- >
	      <!--
		       one --
		    -- two --
		    - -	three -	-
	      >

       The first has an	illegal	space after the	mdo, the second	has  the  word
       two outside a comment, and the third has	the text - - three - - outside
       the comment.

       Given these rules, can SGML comments be nested?	It might  appear  that
       they can, since

	      <!-- <!--	--> -->
	      <!-- <!--	--> <!-- --> -->

       are both	accepted by an SGML parser.  However, the nesting is illusory,
       since the first has two comments, containing the	text <!	and >, and the
       third  has  three comments: <! and > <! and >.  As soon as we put words
       between the hyphen pairs, such as

	      <!-- one <!-- two	--> three -->
	      <!-- one <!-- two	--> <!-- three --> four	-->

       the word	two lies outside the comment in	the first, and two  and	 three
       are  outside  the comment in the	second.	 Therefore, SGML and HTML com-
       ments cannot in general be nested.

       Finally,	because	of the special significance of -- as  both  a  comment
       start  and a comment end	inside a markup	declaration, you must be care-
       ful about using adjacent	hyphens	in the comment text.   In  particular,
       if you use a line of hyphens to set off one block of text from another,
       the number of hyphens must be a multiple	of 4, such as  this  60-hyphen
       example:

	      <!------------------------------------------------------------>

       Having 57, 58, 59, 61, 62, or 63	hyphens	won't do!

       html-pretty  does  not  distinguish markup declarations,	beginning with
       _!, from	tags, beginning	with _,	except for comments, which have	to  be
       parsed  separately  anyway to handle the	pairs-of-pairs-of-hyphens bal-
       ance requirement.  Thus,	it considers !DOCTYPE to be a tag  name,  when
       strictly	speaking, the !	 is part of the	markup declaration open.  How-
       ever, since the closing character _ can always  be  represented	by  an
       SGML  entity, _lt;, html-pretty can safely assume that anything between
       angle brackets is a `tag'.  That	is why the style files have a rule

	      doctype :		   !DOCTYPE

       with the	exclamation mark prefixed to the word DOCTYPE.

HTML GRAMMAR CONSTRAINTS
       It is not immediately obvious from the HTML grammars  just  which  tags
       can be contained	in, or by, other tag environments.  The	list below was
       automatically extracted from the	HTML grammar files by software	devel-
       oped especially for, and	included with, the html-pretty distribution.

       The  grammar rules for some environments	explicitly forbid certain tags
       from appearing in those environments; this is indicated	in  the	 lists
       below by	the prefix cannot contain:.

       Because	the HTML definition is evolving, many tags are defined only in
       certain grammar files. In such a	case, the grammar level	 is  indicated
       by a suffix with	a colon	and a sorted list of one or more levels: 2, 3,
       3.2, 4C (4-Cougar), 4L (4-loose), and M (Mosaic	and  Netscape).	  [The
       level  4-strict	from  July and November, 1997, is excluded because the
       grammar file omits many heavily-used tags, in anticipation  that	 their
       features	will be	provided by style sheets.]

       Although	 there	are  other  HTML grammar versions, these are the major
       ones that are important for current browsers.  If no grammar level list
       is  present,  then  the tag is available	in all of the levels listed at
       the start of this paragraph.

       The `tag' #PCDATA means parsed character	data, an SGML term for text of
       zero  or	 more  ordinary	characters and/or SGML named and numeric enti-
       ties, such as _quot; and	_#34;.

       The `tag' ANY is	a catch-all that means #PCDATA,	or any	SGML  tag  de-
       fined  in  the grammar.	It should not be used in SGML grammars,	but it
       is present in the Mosaic/Netscape grammar file, html-mcom.dtd.

       The `tag' CDATA means character data, an	SGML term  for	zero  or  more
       characters  that	 are  not further examined, except for the purposes of
       scanning	for an end tag.	 This corresponds to verbatim text in typeset-
       ting and	word-processing	systems.

       The  special  `tag' EMPTY means that the	environment is empty, and fur-
       ther, that a matching end tag is	forbidden.

       If no end tag is	shown in the paragraph heading,	then it	must be	 omit-
       ted in HTML files.

       Unless  suffixed	 by optional, all tags listed in the remainder of this
       section are required.  However, if a grammar level list is attached  to
       optional	 or  required,	then  the tag is defined only in those grammar
       levels.

       Use these lists as a portability	guide: if a tag	is implemented in only
       specified  grammar  levels, then	documents which	use it are more	likely
       to be displayed improperly by Web browsers.

       #PCDATA
	      contained	in: A ABBR:4L ABBREV:3 ABOVE:3 ACRONYM:3 ADDRESS
	      APPLET:3.2,4L AU:3 B BAR:3 BDO:4C,4L BELOW:3 BIG:3,3.2,4C,4L
	      BLINK:M BLOCKQUOTE BODY BOX:3 BQ:3 BT:3 BUTTON:4L
	      CAPTION:3,3.2,4C,4L CENTER:3.2,4C,4L,M CITE CODE CREDIT:3	DD
	      DDOT:3 DEL:3,4L DFN:3,3.2,4C,4L DIV:3,3.2,4C,4L DOT:3 DT EM
	      FIELDSET:4C,4L FIG:3 FONT:3.2,4C,4L,M FORM H1 H2 H3 H4 H5	H6
	      HAT:3 I IFRAME:4L	INS:3,4L ITEM:3	KBD LABEL:4C,4L	LANG:3
	      LEGEND:4L	LH:3 LI	MATH:3 NOBR:M NOSCRIPT:4L NOTE:3 OBJECT:4C,4L
	      OF:3 OPTION P PERSON:3 PRE Q:3,4C,4L ROOT:3 S:3,4C,4L SAMP
	      SMALL:3,3.2,4C,4L	SPAN:4C,4L SQRT:3 STRIKE:3.2,4L	STRONG STYLE:3
	      SUB:3,3.2,4C,4L SUP:3,3.2,4C,4L T:3 TD:3,3.2,4C,4L TEXTAREA
	      TEXTFLOW:4C TH:3,3.2,4C,4L TILDE:3 TITLE TT U:3,3.2,4C,4L	VAR
	      VEC:3
       <A> ... </A>
	      contained	in: ABBR:4L ABBREV:3 ACRONYM:3 ADDRESS APPLET:3.2,4L
	      AU:3 B BDO:4C,4L BIG:3,3.2,4C,4L BLINK:M BLOCKQUOTE BODY BQ:3
	      CAPTION:3,3.2,4C,4L CENTER:3.2,4C,4L,M CITE CODE CREDIT:3	DD
	      DEL:3,4L DFN:3,3.2,4C,4L DIV:3,3.2,4C,4L DT EM FIELDSET:4C,4L
	      FIG:3 FONT:3.2,4C,4L,M FORM H1 H2	H3 H4 H5 H6 I IFRAME:4L
	      INS:3,4L KBD LABEL:4C,4L LANG:3 LEGEND:4L	LH:3 LI	NOBR:M
	      NOSCRIPT:4L NOTE:3 OBJECT:4C,4L P	PERSON:3 PRE Q:3,4C,4L
	      S:3,4C,4L	SAMP SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L	STRONG
	      SUB:3,3.2,4C,4L SUP:3,3.2,4C,4L TD:3,3.2,4C,4L TEXTFLOW:4C
	      TH:3,3.2,4C,4L TT	U:3,3.2,4C,4L VAR
	      contains:	#PCDATA	ABBR:4L	ABBREV:3 ACRONYM:3 APPLET:3.2,4C,4L
	      AU:3 B BASEFONT:3.2,4C,4L,M BDO:4C,4L BIG:3,3.2,4C,4L BLINK:M BR
	      BUTTON:4L	CENTER:M CITE CODE DEL:3 DFN:3,3.2,4C,4L EM
	      FONT:3.2,4C,4L,M H1:2,3,M	H2:2,3,M H3:2,3,M H4:2,3,M H5:2,3,M
	      H6:2,3,M I IFRAME:4L IMG INPUT:3.2,4C,4L INS:3 KBD LABEL:4C,4L
	      LANG:3 MAP:3.2,4C,4L MATH:3 NOBR:M OBJECT:4C,4L PERSON:3
	      Q:3,4C,4L	S:3,4C,4L SAMP SCRIPT:3.2,4C,4L	SELECT:3.2,4C,4L
	      SMALL:3,3.2,4C,4L	SPAN:4C,4L STRIKE:3.2,4L STRONG	STYLE:4C
	      SUB:3,3.2,4C,4L SUP:3,3.2,4C,4L TAB:3 TEXTAREA:3.2,4C,4L TT
	      U:3,3.2,4C,4L VAR	WBR:M
	      cannot contain: A
       <ABBR> required:4L ... </ABBR> required:4L
	      contained	in: A:4L ABBR:4L ADDRESS:4L APPLET:4L B:4L BDO:4L
	      BIG:4L BLOCKQUOTE:4L BODY:4L BUTTON:4L CAPTION:4L	CENTER:4L
	      CITE:4L CODE:4L DD:4L DEL:4L DFN:4L DIV:4L DT:4L EM:4L
	      FIELDSET:4L FONT:4L FORM:4L H1:4L	H2:4L H3:4L H4:4L H5:4L	H6:4L
	      I:4L IFRAME:4L INS:4L KBD:4L LABEL:4L LEGEND:4L LI:4L
	      NOSCRIPT:4L OBJECT:4L P:4L PRE:4L	Q:4L S:4L SAMP:4L SMALL:4L
	      SPAN:4L STRIKE:4L	STRONG:4L SUB:4L SUP:4L	TD:4L TH:4L TT:4L U:4L
	      VAR:4L
	      contains:	#PCDATA:4L A:4L	ABBR:4L	APPLET:4L B:4L BASEFONT:4L
	      BDO:4L BIG:4L BR:4L BUTTON:4L CITE:4L CODE:4L DFN:4L EM:4L
	      FONT:4L I:4L IFRAME:4L IMG:4L INPUT:4L KBD:4L LABEL:4L MAP:4L
	      OBJECT:4L	Q:4L S:4L SAMP:4L SCRIPT:4L SELECT:4L SMALL:4L SPAN:4L
	      STRIKE:4L	STRONG:4L SUB:4L SUP:4L	TEXTAREA:4L TT:4L U:4L VAR:4L
       <ABBREV>	required:3 ... </ABBREV> required:3
	      contained	in: A:3	ABBREV:3 ACRONYM:3 ADDRESS:3 AU:3 B:3 BIG:3
	      BLOCKQUOTE:3 BODY:3 BQ:3 CAPTION:3 CITE:3	CODE:3 CREDIT:3	DD:3
	      DEL:3 DFN:3 DIV:3	DT:3 EM:3 FIG:3	FORM:3 H1:3 H2:3 H3:3 H4:3
	      H5:3 H6:3	I:3 INS:3 KBD:3	LANG:3 LH:3 LI:3 NOTE:3	P:3 PERSON:3
	      PRE:3 Q:3	S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3	TD:3 TH:3 TT:3
	      U:3 VAR:3
	      contains:	#PCDATA:3 A:3 ABBREV:3 ACRONYM:3 AU:3 B:3 BIG:3	BR:3
	      CITE:3 CODE:3 DEL:3 DFN:3	EM:3 I:3 IMG:3 INS:3 KBD:3 LANG:3
	      MATH:3 PERSON:3 Q:3 S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3
	      TAB:3 TT:3 U:3 VAR:3
       <ABOVE> required:3 ... </ABOVE> required:3
	      contained	in: ABOVE:3 BAR:3 BELOW:3 BOX:3	BT:3 DDOT:3 DOT:3
	      HAT:3 ITEM:3 MATH:3 OF:3 ROOT:3 SQRT:3 T:3 TILDE:3 VEC:3
	      contains:	#PCDATA:3 ABOVE:3 ARRAY:3 B:3 BAR:3 BELOW:3 BOX:3 BT:3
	      DDOT:3 DOT:3 HAT:3 ROOT:3	SQRT:3 SUB:3 SUP:3 T:3 TILDE:3 VEC:3
       <ACRONYM> required:3 ...	</ACRONYM> required:3
	      contained	in: A:3	ABBREV:3 ACRONYM:3 ADDRESS:3 AU:3 B:3 BIG:3
	      BLOCKQUOTE:3 BODY:3 BQ:3 CAPTION:3 CITE:3	CODE:3 CREDIT:3	DD:3
	      DEL:3 DFN:3 DIV:3	DT:3 EM:3 FIG:3	FORM:3 H1:3 H2:3 H3:3 H4:3
	      H5:3 H6:3	I:3 INS:3 KBD:3	LANG:3 LH:3 LI:3 NOTE:3	P:3 PERSON:3
	      PRE:3 Q:3	S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3	TD:3 TH:3 TT:3
	      U:3 VAR:3
	      contains:	#PCDATA:3 A:3 ABBREV:3 ACRONYM:3 AU:3 B:3 BIG:3	BR:3
	      CITE:3 CODE:3 DEL:3 DFN:3	EM:3 I:3 IMG:3 INS:3 KBD:3 LANG:3
	      MATH:3 PERSON:3 Q:3 S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3
	      TAB:3 TT:3 U:3 VAR:3
       <ADDRESS> ... </ADDRESS>
	      contained	in: APPLET:4L BLOCKQUOTE BODY BQ:3 BUTTON:4L
	      CENTER:3.2,4C,4L,M DD:4L DEL:4L DIV:3,3.2,4C,4L FIELDSET:4C,4L
	      FIG:3 FORM IFRAME:4L INS:4L LI:4L	NOSCRIPT:4L NOTE:3
	      OBJECT:4C,4L TD:3,3.2,4C,4L TH:3,3.2,4C,4L
	      contains:	#PCDATA	A ABBR:4L ABBREV:3 ACRONYM:3 APPLET:3.2,4C,4L
	      AU:3 B BASEFONT:3.2,4C,4L,M BDO:4C,4L BIG:3,3.2,4C,4L BLINK:M BR
	      BUTTON:4L	CENTER:M CITE CODE DEL:3 DFN:3,3.2,4C,4L EM
	      FONT:3.2,4C,4L,M I IFRAME:4L IMG INPUT:3.2,4C,4L INS:3 KBD
	      LABEL:4C,4L LANG:3 MAP:3.2,4C,4L MATH:3 NOBR:M OBJECT:4C,4L P
	      PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP	SCRIPT:3.2,4C,4L
	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
	      STRONG STYLE:4C SUB:3,3.2,4C,4L SUP:3,3.2,4C,4L TAB:3
	      TEXTAREA:3.2,4C,4L TT U:3,3.2,4C,4L VAR WBR:M
       ANY
	      contained	in: BASEFONT:M
       <APPLET>	required:3.2,4C,4L ... </APPLET> required:3.2,4C,4L
	      contained	in: A:3.2,4C,4L	ABBR:4L	ADDRESS:3.2,4C,4L
	      APPLET:3.2,4L B:3.2,4C,4L	BDO:4C,4L BIG:3.2,4C,4L
	      BLOCKQUOTE:3.2,4C,4L BODY:3.2,4C,4L BUTTON:4L CAPTION:3.2,4C,4L
	      CENTER:3.2,4C,4L CITE:3.2,4C,4L CODE:3.2,4C,4L DD:3.2,4C,4L
	      DEL:4L DFN:3.2,4C,4L DIV:3.2,4C,4L DT:3.2,4C,4L EM:3.2,4C,4L
	      FIELDSET:4C,4L FONT:3.2,4C,4L FORM:3.2,4C,4L H1:3.2,4C,4L
	      H2:3.2,4C,4L H3:3.2,4C,4L	H4:3.2,4C,4L H5:3.2,4C,4L H6:3.2,4C,4L
	      I:3.2,4C,4L IFRAME:4L INS:4L KBD:3.2,4C,4L LABEL:4C,4L LEGEND:4L
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	      TD:3.2,4C,4L TEXTFLOW:4C TH:3.2,4C,4L TT:3.2,4C,4L U:3.2,4C,4L
	      VAR:3.2,4C,4L
	      contains:	AREA:3.2,4C,4L
       <MATH> required:3 ... </MATH> required:3
	      contained	in: A:3	ABBREV:3 ACRONYM:3 ADDRESS:3 AU:3 B:3 BIG:3
	      BLOCKQUOTE:3 BODY:3 BQ:3 CAPTION:3 CITE:3	CODE:3 CREDIT:3	DD:3
	      DEL:3 DFN:3 DIV:3	DT:3 EM:3 FIG:3	FORM:3 H1:3 H2:3 H3:3 H4:3
	      H5:3 H6:3	I:3 INS:3 KBD:3	LANG:3 LH:3 LI:3 NOTE:3	P:3 PERSON:3
	      Q:3 S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3 TD:3 TH:3 TT:3 U:3
	      VAR:3
	      contains:	#PCDATA:3 ABOVE:3 ARRAY:3 B:3 BAR:3 BELOW:3 BOX:3 BT:3
	      DDOT:3 DOT:3 HAT:3 ROOT:3	SQRT:3 SUB:3 SUP:3 T:3 TILDE:3 VEC:3
	      cannot contain: A:3 ABBREV:3 ACRONYM:3 AU:3 BIG:3	BR:3 CITE:3
	      CODE:3 DEL:3 DFN:3 EM:3 I:3 IMG:3	INS:3 KBD:3 LANG:3 MATH:3
	      PERSON:3 Q:3 S:3 SAMP:3 SMALL:3 STRONG:3 TAB:3 TT:3 U:3 VAR:3
       <MENU> ... </MENU> (deprecated)
	      contained	in: APPLET:4L BLOCKQUOTE BODY BQ:3 BUTTON:4L
	      CENTER:3.2,4C,4L,M DD DEL:4L DIV:3,3.2,4C,4L FIELDSET:4C,4L
	      FIG:3 FORM IFRAME:4L INS:4L LI NOSCRIPT:4L NOTE:3	OBJECT:4C,4L
	      TD:3,3.2,4C,4L TH:3,3.2,4C,4L
	      contains:	LI
	      cannot contain: ADDRESS:4L BLOCKQUOTE BQ:3 CENTER:3.2,4C,4L,M
	      DIR DIV:3.2,4C,4L	DL FIELDSET:4C,4L FIG:3	FORM H1:4L H2:4L H3:4L
	      H4:4L H5:4L H6:4L	HR:3.2,4C,4L ISINDEX LISTING:2,3,3.2,4C,M MENU
	      NOFRAMES:4L NOSCRIPT:4L NOTE:3 OL	P PRE TABLE:3,3.2,4C,4L	UL
	      XMP:2,3,3.2,4C,M
       <META>
	      contained	in: HEAD
	      contains:	EMPTY
       <NEXTID>	required:2,3,M (deprecated)
	      contained	in: HEAD:2,3,M
	      contains:	EMPTY:2,3,M
       <NOBR> required:M ... </NOBR> required:M
	      contained	in: A:M	ADDRESS:M B:M BLINK:M BLOCKQUOTE:M BODY:M
	      CENTER:M CITE:M CODE:M DD:M DT:M EM:M FONT:M FORM:M H1:M H2:M
	      H3:M H4:M	H5:M H6:M I:M KBD:M LI:M NOBR:M	P:M SAMP:M STRONG:M
	      TT:M VAR:M
	      contains:	#PCDATA:M A:M B:M BASEFONT:M BLINK:M BR:M CENTER:M
	      CITE:M CODE:M EM:M FONT:M	I:M IMG:M KBD:M	NOBR:M SAMP:M STRONG:M
	      TT:M VAR:M WBR:M
       <NOFRAMES> required:4L ... </NOFRAMES> required:4L
	      contained	in: APPLET:4L BLOCKQUOTE:4L BODY:4L BUTTON:4L
	      CENTER:4L	DD:4L DEL:4L DIV:4L FIELDSET:4L	FORM:4L	FRAMESET:4L
	      IFRAME:4L	INS:4L LI:4L NOSCRIPT:4L OBJECT:4L TD:4L TH:4L
	      contains:	BODY:4L
	      cannot contain: #PCDATA:4L A:4L ABBR:4L ADDRESS:4L APPLET:4L
	      B:4L BASEFONT:4L BDO:4L BIG:4L BLOCKQUOTE:4L BR:4L BUTTON:4L
	      CENTER:4L	CITE:4L	CODE:4L	DFN:4L DIR:4L DIV:4L DL:4L EM:4L
	      FIELDSET:4L FONT:4L FORM:4L H1:4L	H2:4L H3:4L H4:4L H5:4L	H6:4L
	      HR:4L I:4L IFRAME:4L IMG:4L INPUT:4L ISINDEX:4L KBD:4L LABEL:4L
	      MAP:4L MENU:4L NOFRAMES:4L NOSCRIPT:4L OBJECT:4L OL:4L P:4L
	      PRE:4L Q:4L S:4L SAMP:4L SCRIPT:4L SELECT:4L SMALL:4L SPAN:4L
	      STRIKE:4L	STRONG:4L SUB:4L SUP:4L	TABLE:4L TEXTAREA:4L TT:4L
	      U:4L UL:4L VAR:4L
       <NOSCRIPT> required:4L ... </NOSCRIPT> required:4L
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	      CENTER:4L	DD:4L DEL:4L DIV:4L FIELDSET:4L	FORM:4L	IFRAME:4L
	      INS:4L LI:4L NOSCRIPT:4L OBJECT:4L TD:4L TH:4L
	      contains:	#PCDATA:4L A:4L	ABBR:4L	ADDRESS:4L APPLET:4L B:4L
	      BASEFONT:4L BDO:4L BIG:4L	BLOCKQUOTE:4L BR:4L BUTTON:4L
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	      FIELDSET:4L FONT:4L FORM:4L H1:4L	H2:4L H3:4L H4:4L H5:4L	H6:4L
	      HR:4L I:4L IFRAME:4L IMG:4L INPUT:4L ISINDEX:4L KBD:4L LABEL:4L
	      MAP:4L MENU:4L NOFRAMES:4L NOSCRIPT:4L OBJECT:4L OL:4L P:4L
	      PRE:4L Q:4L S:4L SAMP:4L SCRIPT:4L SELECT:4L SMALL:4L SPAN:4L
	      STRIKE:4L	STRONG:4L SUB:4L SUP:4L	TABLE:4L TEXTAREA:4L TT:4L
	      U:4L UL:4L VAR:4L
       <NOTE> required:3 ... </NOTE> required:3
	      contained	in: BLOCKQUOTE:3 BODY:3	BQ:3 DD:3 DIV:3	FIG:3 FORM:3
	      LI:3 NOTE:3 TD:3 TH:3
	      contains:	#PCDATA:3 A:3 ABBREV:3 ACRONYM:3 ADDRESS:3 AU:3	B:3
	      BIG:3 BLOCKQUOTE:3 BQ:3 BR:3 CITE:3 CODE:3 DEL:3 DFN:3 DIR:3
	      DIV:3 DL:3 EM:3 FIG:3 FORM:3 H1:3	H2:3 H3:3 H4:3 H5:3 H6:3 HR:3
	      I:3 IMG:3	INS:3 ISINDEX:3	KBD:3 LANG:3 LISTING:3 MATH:3 MENU:3
	      NOTE:3 OL:3 P:3 PERSON:3 PRE:3 Q:3 S:3 SAMP:3 SMALL:3 STRONG:3
	      SUB:3 SUP:3 TAB:3	TABLE:3	TT:3 U:3 UL:3 VAR:3 XMP:3
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	      BDO:4C,4L	BIG:4C,4L BLOCKQUOTE:4C,4L BODY:4C,4L BUTTON:4L
	      CAPTION:4C,4L CENTER:4C,4L CITE:4C,4L CODE:4C,4L DD:4C,4L	DEL:4L
	      DFN:4C,4L	DIV:4C,4L DT:4C,4L EM:4C,4L FIELDSET:4C,4L FONT:4C,4L
	      FORM:4C,4L H1:4C,4L H2:4C,4L H3:4C,4L H4:4C,4L H5:4C,4L H6:4C,4L
	      I:4C,4L IFRAME:4L	INS:4L KBD:4C,4L LABEL:4C,4L LEGEND:4L
	      LI:4C,4L NOSCRIPT:4L OBJECT:4C,4L	P:4C,4L	PRE:4C Q:4C,4L S:4C,4L
	      SAMP:4C,4L SMALL:4C,4L SPAN:4C,4L	STRIKE:4L STRONG:4C,4L
	      SUB:4C,4L	SUP:4C,4L TD:4C,4L TEXTFLOW:4C TH:4C,4L	TT:4C,4L
	      U:4C,4L VAR:4C,4L
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	      BLOCKQUOTE:4C,4L BR:4C,4L	BUTTON:4L CENTER:4C,4L CITE:4C,4L
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	      FIELDSET:4C,4L FONT:4C,4L	FORM:4C,4L H1:4C,4L H2:4C,4L H3:4C,4L
	      H4:4C,4L H5:4C,4L	H6:4C,4L HR:4C,4L I:4C,4L IFRAME:4L IMG:4C,4L
	      INPUT:4C,4L ISINDEX:4C,4L	KBD:4C,4L LABEL:4C,4L LISTING:4C
	      MAP:4C,4L	MENU:4C,4L NOFRAMES:4L NOSCRIPT:4L OBJECT:4C,4L
	      OL:4C,4L P:4C,4L PARAM:4C,4L PRE:4C,4L Q:4C,4L S:4C,4L
	      SAMP:4C,4L SCRIPT:4C,4L SELECT:4C,4L SMALL:4C,4L SPAN:4C,4L
	      STRIKE:4L	STRONG:4C,4L STYLE:4C SUB:4C,4L	SUP:4C,4L TABLE:4C,4L
	      TEXTAREA:4C,4L TT:4C,4L U:4C,4L UL:4C,4L VAR:4C,4L XMP:4C
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	      contains:	#PCDATA:3 ABOVE:3 ARRAY:3 B:3 BAR:3 BELOW:3 BOX:3 BT:3
	      DDOT:3 DOT:3 HAT:3 ROOT:3	SQRT:3 SUB:3 SUP:3 T:3 TILDE:3 VEC:3
       <OL> ...	</OL>
	      contained	in: APPLET:4L BLOCKQUOTE BODY BQ:3 BUTTON:4L
	      CENTER:3.2,4C,4L,M DD DEL:4L DIV:3,3.2,4C,4L FIELDSET:4C,4L
	      FIG:3 FORM IFRAME:4L INS:4L LI NOSCRIPT:4L NOTE:3	OBJECT:4C,4L
	      TD:3,3.2,4C,4L TH:3,3.2,4C,4L
	      contains:	LH:3 LI
       <OPTGROUP> required:4L ... </OPTGROUP> required:4L
	      contained	in: OPTGROUP:4L	SELECT:4L
	      contains:	OPTGROUP:4L OPTION:4L
       <OPTION>	... </OPTION> optional
	      contained	in: OPTGROUP:4L	SELECT
	      contains:	#PCDATA
       <OVER> required:3
	      contained	in: BOX:3
	      contains:	EMPTY:3
       <OVERLAY> required:3
	      contained	in: FIG:3
	      contains:	EMPTY:3
       <P> ... </P> optional
	      contained	in: ADDRESS APPLET:4L BLOCKQUOTE BODY BQ:3 BUTTON:4L
	      CENTER:3.2,4C,4L,M DD DEL:4L DIV:3,3.2,4C,4L FIELDSET:4C,4L
	      FIG:3 FORM IFRAME:4L INS:4L LI NOSCRIPT:4L NOTE:3	OBJECT:4C,4L
	      TD:3,3.2,4C,4L TH:3,3.2,4C,4L
	      contains:	#PCDATA	A ABBR:4L ABBREV:3 ACRONYM:3 APPLET:3.2,4C,4L
	      AU:3 B BASEFONT:3.2,4C,4L,M BDO:4C,4L BIG:3,3.2,4C,4L BLINK:M BR
	      BUTTON:4L	CENTER:M CITE CODE DEL:3 DFN:3,3.2,4C,4L EM
	      FONT:3.2,4C,4L,M I IFRAME:4L IMG INPUT:3.2,4C,4L INS:3 KBD
	      LABEL:4C,4L LANG:3 MAP:3.2,4C,4L MATH:3 NOBR:M OBJECT:4C,4L
	      PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP	SCRIPT:3.2,4C,4L
	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
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	      TEXTAREA:3.2,4C,4L TT U:3,3.2,4C,4L VAR WBR:M
       <PARAM> required:3.2,4C,4L
	      contained	in: APPLET:3.2,4C,4L OBJECT:4C,4L
	      contains:	EMPTY:3.2,4C,4L
       <PERSON>	required:3 ... </PERSON> required:3
	      contained	in: A:3	ABBREV:3 ACRONYM:3 ADDRESS:3 AU:3 B:3 BIG:3
	      BLOCKQUOTE:3 BODY:3 BQ:3 CAPTION:3 CITE:3	CODE:3 CREDIT:3	DD:3
	      DEL:3 DFN:3 DIV:3	DT:3 EM:3 FIG:3	FORM:3 H1:3 H2:3 H3:3 H4:3
	      H5:3 H6:3	I:3 INS:3 KBD:3	LANG:3 LH:3 LI:3 NOTE:3	P:3 PERSON:3
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	      U:3 VAR:3
	      contains:	#PCDATA:3 A:3 ABBREV:3 ACRONYM:3 AU:3 B:3 BIG:3	BR:3
	      CITE:3 CODE:3 DEL:3 DFN:3	EM:3 I:3 IMG:3 INS:3 KBD:3 LANG:3
	      MATH:3 PERSON:3 Q:3 S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3
	      TAB:3 TT:3 U:3 VAR:3
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       optional:2,3,3.2,4C,M (deprecated)
	      contained	in: HTML:2,3.2,4C,M
	      contains:	CDATA:2,3,3.2,4C,M

	      NB: The meaning of this tag is aberrant, in that the closing tag
	      is not supposed to be present, even though the grammar says that
	      it  is  optional:	 the environment instead terminates at end-of-
	      file.  Browsers differ in	their handling of the  end  tag:  some
	      display  it  as ordinary text, and others	terminate the environ-
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       <PRE> ... </PRE>
	      contained	in: APPLET:4L BLOCKQUOTE BODY BQ:3 BUTTON:4L
	      CENTER:3.2,4C,4L,M DD DEL:4L DIV:3,3.2,4C,4L FIELDSET:4C,4L
	      FIG:3 FORM IFRAME:4L INS:4L LI NOSCRIPT:4L NOTE:3	OBJECT:4C,4L
	      TD:3,3.2,4C,4L TH:3,3.2,4C,4L
	      contains:	#PCDATA	A ABBR:4L ABBREV:3 ACRONYM:3 APPLET:3.2,4C
	      AU:3 B BASEFONT:3.2,4C BDO:4C,4L BLINK:M BR BUTTON:4L CITE CODE
	      DEL:3 DFN:3,3.2,4C,4L EM FONT:M HR:2,M I IFRAME:4L
	      INPUT:3.2,4C,4L INS:3 KBD	LABEL:4C,4L LANG:3 MAP:3.2,4C,4L
	      OBJECT:4C	PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP SCRIPT:3.2,4C,4L
	      SELECT:3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L	STRONG STYLE:4C
	      TEXTAREA:3.2,4C,4L TT U:3,3.2,4C,4L VAR
	      cannot contain: APPLET:4L	BASEFONT:4L BIG:3,3.2,4C,4L
	      FONT:3.2,4C,4L IMG:3,3.2,4C,4L MATH:3 OBJECT:4L
	      SMALL:3,3.2,4C,4L	SUB:3,3.2,4C,4L	SUP:3,3.2,4C,4L	TAB:3
       <Q> required:3,4C,4L ...	</Q> required:3,4C,4L
	      contained	in: A:3,4C,4L ABBR:4L ABBREV:3 ACRONYM:3
	      ADDRESS:3,4C,4L APPLET:4L	AU:3 B:3,4C,4L BDO:4C,4L BIG:3,4C,4L
	      BLOCKQUOTE:3,4C,4L BODY:3,4C,4L BQ:3 BUTTON:4L CAPTION:3,4C,4L
	      CENTER:4C,4L CITE:3,4C,4L	CODE:3,4C,4L CREDIT:3 DD:3,4C,4L
	      DEL:3,4L DFN:3,4C,4L DIV:3,4C,4L DT:3,4C,4L EM:3,4C,4L
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	      LI:3,4C,4L NOSCRIPT:4L NOTE:3 OBJECT:4C,4L P:3,4C,4L PERSON:3
	      PRE:3,4C,4L Q:3,4C,4L S:3,4C,4L SAMP:3,4C,4L SMALL:3,4C,4L
	      SPAN:4C,4L STRIKE:4L STRONG:3,4C,4L SUB:3,4C,4L SUP:3,4C,4L
	      TD:3,4C,4L TEXTFLOW:4C TH:3,4C,4L	TT:3,4C,4L U:3,4C,4L
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	      contains:	#PCDATA:3,4C,4L	A:3,4C,4L ABBR:4L ABBREV:3 ACRONYM:3
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	      EM:3,4C,4L FONT:4C,4L I:3,4C,4L IFRAME:4L	IMG:3,4C,4L
	      INPUT:4C,4L INS:3	KBD:3,4C,4L LABEL:4C,4L	LANG:3 MAP:4C,4L
	      MATH:3 OBJECT:4C,4L PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP:3,4C,4L
	      SCRIPT:4C,4L SELECT:4C,4L	SMALL:3,4C,4L SPAN:4C,4L STRIKE:4L
	      STRONG:3,4C,4L STYLE:4C SUB:3,4C,4L SUP:3,4C,4L TAB:3
	      TEXTAREA:4C,4L TT:3,4C,4L	U:3,4C,4L VAR:3,4C,4L
       <RIGHT> required:3
	      contained	in: BOX:3
	      contains:	EMPTY:3
       <ROOT> required:3 ... </ROOT> required:3
	      contained	in: ABOVE:3 BAR:3 BELOW:3 BOX:3	BT:3 DDOT:3 DOT:3
	      HAT:3 ITEM:3 MATH:3 OF:3 ROOT:3 SQRT:3 T:3 TILDE:3 VEC:3
	      contains:	#PCDATA:3 ABOVE:3 ARRAY:3 B:3 BAR:3 BELOW:3 BOX:3 BT:3
	      DDOT:3 DOT:3 HAT:3 OF:3 ROOT:3 SQRT:3 SUB:3 SUP:3	T:3 TILDE:3
	      VEC:3
       <ROW> required:3	... </ROW> optional:3
	      contained	in: ARRAY:3
	      contains:	ITEM:3
       <S> required:3,4C,4L ...	</S> required:3,4C,4L
	      contained	in: A:3,4C,4L ABBR:4L ABBREV:3 ACRONYM:3
	      ADDRESS:3,4C,4L APPLET:4L	AU:3 B:3,4C,4L BDO:4C,4L BIG:3,4C,4L
	      BLOCKQUOTE:3,4C,4L BODY:3,4C,4L BQ:3 BUTTON:4L CAPTION:3,4C,4L
	      CENTER:4C,4L CITE:3,4C,4L	CODE:3,4C,4L CREDIT:3 DD:3,4C,4L
	      DEL:3,4L DFN:3,4C,4L DIV:3,4C,4L DT:3,4C,4L EM:3,4C,4L
	      FIELDSET:4C,4L FIG:3 FONT:4C,4L FORM:3,4C,4L H1:3,4C,4L
	      H2:3,4C,4L H3:3,4C,4L H4:3,4C,4L H5:3,4C,4L H6:3,4C,4L I:3,4C,4L
	      IFRAME:4L	INS:3,4L KBD:3,4C,4L LABEL:4C,4L LANG:3	LEGEND:4L LH:3
	      LI:3,4C,4L NOSCRIPT:4L NOTE:3 OBJECT:4C,4L P:3,4C,4L PERSON:3
	      PRE:3,4C,4L Q:3,4C,4L S:3,4C,4L SAMP:3,4C,4L SMALL:3,4C,4L
	      SPAN:4C,4L STRIKE:4L STRONG:3,4C,4L SUB:3,4C,4L SUP:3,4C,4L
	      TD:3,4C,4L TEXTFLOW:4C TH:3,4C,4L	TT:3,4C,4L U:3,4C,4L
	      VAR:3,4C,4L
	      contains:	#PCDATA:3,4C,4L	A:3,4C,4L ABBR:4L ABBREV:3 ACRONYM:3
	      APPLET:4C,4L AU:3	B:3,4C,4L BASEFONT:4C,4L BDO:4C,4L BIG:3,4C,4L
	      BR:3,4C,4L BUTTON:4L CITE:3,4C,4L	CODE:3,4C,4L DEL:3 DFN:3,4C,4L
	      EM:3,4C,4L FONT:4C,4L I:3,4C,4L IFRAME:4L	IMG:3,4C,4L
	      INPUT:4C,4L INS:3	KBD:3,4C,4L LABEL:4C,4L	LANG:3 MAP:4C,4L
	      MATH:3 OBJECT:4C,4L PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP:3,4C,4L
	      SCRIPT:4C,4L SELECT:4C,4L	SMALL:3,4C,4L SPAN:4C,4L STRIKE:4L
	      STRONG:3,4C,4L STYLE:4C SUB:3,4C,4L SUP:3,4C,4L TAB:3
	      TEXTAREA:4C,4L TT:3,4C,4L	U:3,4C,4L VAR:3,4C,4L
       <SAMP> ... </SAMP>
	      contained	in: A ABBR:4L ABBREV:3 ACRONYM:3 ADDRESS APPLET:3.2,4L
	      AU:3 B BDO:4C,4L BIG:3,3.2,4C,4L BLINK:M BLOCKQUOTE BODY BQ:3
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	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
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	      S:4C,4L SAMP:4C,4L SMALL:4C,4L SPAN:4C,4L	STRIKE:4L STRONG:4C,4L
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	      IMG:4C,4L	INPUT:4C,4L KBD:4C,4L LABEL:4C,4L MAP:4C,4L
	      OBJECT:4C,4L Q:4C,4L S:4C,4L SAMP:4C,4L SCRIPT:4C,4L
	      SELECT:4C,4L SMALL:4C,4L SPAN:4C,4L STRIKE:4L STRONG:4C,4L
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	      MAP:3.2,4L OBJECT:4L Q:4L	S:4L SAMP:3.2,4L SCRIPT:3.2,4L
	      SELECT:3.2,4L SMALL:3.2,4L SPAN:4L STRIKE:3.2,4L STRONG:3.2,4L
	      SUB:3.2,4L SUP:3.2,4L TEXTAREA:3.2,4L TT:3.2,4L U:3.2,4L
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	      PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP	SCRIPT:3.2,4C,4L
	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
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	      DD:3,3.2,4C,4L DDOT:3 DEL:3,4L DFN:3,3.2,4C,4L DIV:3,3.2,4C,4L
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	      Q:3,4C,4L	S:3,4C,4L SAMP:3,3.2,4C,4L SCRIPT:3.2,4C,4L
	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
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	      ADDRESS:3,3.2,4C,4L APPLET:3.2,4L	AU:3 B:3,3.2,4C,4L BAR:3
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	      CENTER:3.2,4C,4L CITE:3,3.2,4C,4L	CODE:3,3.2,4C,4L CREDIT:3
	      DD:3,3.2,4C,4L DDOT:3 DEL:3,4L DFN:3,3.2,4C,4L DIV:3,3.2,4C,4L
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	      Q:3 S:3 SAMP:3 SMALL:3 STRONG:3 SUB:3 SUP:3 TD:3 TH:3 TT:3 U:3
	      VAR:3
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	      TD:3,3.2,4C,4L TH:3,3.2,4C,4L
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	      TBODY:4C,4L TFOOT:4C,4L THEAD:4C,4L TR:3,3.2
       <TBODY> optional:4C,4L ... </TBODY> optional:4C,4L
	      contained	in: TABLE:4C,4L
	      contains:	TR:4C,4L
       <TD> required:3,3.2,4C,4L ... </TD> optional:3,3.2,4C,4L
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	      contains:	#PCDATA
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	      contains:	#PCDATA:4C A:4C	APPLET:4C B:4C BASEFONT:4C BDO:4C
	      BIG:4C BR:4C CITE:4C CODE:4C DFN:4C EM:4C	FONT:4C	I:4C IMG:4C
	      INPUT:4C KBD:4C LABEL:4C MAP:4C OBJECT:4C	Q:4C S:4C SAMP:4C
	      SCRIPT:4C	SELECT:4C SMALL:4C SPAN:4C STRONG:4C STYLE:4C SUB:4C
	      SUP:4C TEXTAREA:4C TT:4C U:4C VAR:4C
       <TFOOT> required:4C,4L ... </TFOOT> optional:4C,4L
	      contained	in: TABLE:4C,4L
	      contains:	TR:4C,4L
       <TH> required:3,3.2,4C,4L ... </TH> optional:3,3.2,4C,4L
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       <THEAD> required:4C,4L ... </THEAD> optional:4C,4L
	      contained	in: TABLE:4C,4L
	      contains:	TR:4C,4L
       <TILDE> required:3 ... </TILDE> required:3
	      contained	in: ABOVE:3 BAR:3 BELOW:3 BOX:3	BT:3 DDOT:3 DOT:3
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       <TITLE> ... </TITLE>
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	      STYLE:3.2,4C,4L
       <TR> required:3,3.2,4C,4L ... </TR> optional:3,3.2,4C,4L
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	      contains:	TD:3,3.2,4C,4L TH:3,3.2,4C,4L
       <TT> ...	</TT>
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	      IFRAME:4L	INS:3,4L KBD LABEL:4C,4L LANG:3	LEGEND:4L LH:3 LI
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	      FONT:3.2,4C,4L,M I IFRAME:4L IMG INPUT:3.2,4C,4L INS:3 KBD
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	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
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	      TEXTAREA:3.2,4C,4L TT U:3,3.2,4C,4L VAR WBR:M
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	      DFN:3,3.2,4C,4L DIV:3,3.2,4C,4L DT:3,3.2,4C,4L EM:3,3.2,4C,4L
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	      TD:3,3.2,4C,4L TH:3,3.2,4C,4L
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	      TH:3,3.2,4C,4L TT	U:3,3.2,4C,4L VAR
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	      PERSON:3 Q:3,4C,4L S:3,4C,4L SAMP	SCRIPT:3.2,4C,4L
	      SELECT:3.2,4C,4L SMALL:3,3.2,4C,4L SPAN:4C,4L STRIKE:3.2,4L
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	      TEXTAREA:3.2,4C,4L TT U:3,3.2,4C,4L VAR WBR:M
       <VEC> required:3	... </VEC> required:3
	      contained	in: ABOVE:3 BAR:3 BELOW:3 BOX:3	BT:3 DDOT:3 DOT:3
	      HAT:3 ITEM:3 MATH:3 OF:3 ROOT:3 SQRT:3 T:3 TILDE:3 VEC:3
	      contains:	#PCDATA:3 ABOVE:3 ARRAY:3 B:3 BAR:3 BELOW:3 BOX:3 BT:3
	      DDOT:3 DOT:3 HAT:3 ROOT:3	SQRT:3 SUB:3 SUP:3 T:3 TILDE:3 VEC:3
       <WBR> required:M
	      contained	in: A:M	ADDRESS:M B:M BLINK:M BLOCKQUOTE:M BODY:M
	      CENTER:M CITE:M CODE:M DD:M DT:M EM:M FONT:M FORM:M H1:M H2:M
	      H3:M H4:M	H5:M H6:M I:M KBD:M LI:M NOBR:M	P:M SAMP:M STRONG:M
	      TT:M VAR:M
	      contains:	EMPTY:M
       <XMP> required:2,3,3.2,4C,M ... </XMP> required:2,3,3.2,4C,M
       (deprecated)
	      contained	in: BLOCKQUOTE:2,3,3.2,4C,M BODY:2,3,3.2,4C,M BQ:3
	      CENTER:3.2,4C,M DD:2,3,3.2,4C,M DIV:3,3.2,4C FIELDSET:4C FIG:3
	      FORM:2,3,3.2,4C,M	LI:2,3,3.2,4C,M	NOTE:3 OBJECT:4C TD:3,3.2,4C
	      TH:3,3.2,4C
	      contains:	CDATA:2,3,3.2,4C,M

PRETTYPRINTER LIMITATIONS
       Like  LaTeX, Lisp, PostScript, and TeX, SGML is an extensible language.
       In particular, at run time, it is possible to redefine the  syntax  and
       semantics  of  all  lexical elements, including the base	character set,
       the characters that may appear in identifiers, and the special  charac-
       ters that delimit tags or strings.

       In SGML,	this is	conventionally done in SGML declaration	files for syn-
       tax definitions,	and in DTD files, which	are analogous to  LaTeX	 style
       files.	Low-level  typesetting	commands  of  the  flavor  ``select  a
       14-point	Lucida-BoldItalic font'', ``skip down  vertically  6  picas'',
       and  ``draw  a  horizontal  rule	3 ems long'' are notably absent.  SGML
       documents are expected to use only high-level markup commands,  leaving
       the  visual  appearance	entirely  up to	the DTD	specification, and the
       formatting software.

       Unlike LaTeX and	TeX, SGML is not a typesetting system.	It is  only  a
       grammar for a standard markup language, and it is left to SGML software
       implementors to write DTDs, and to provide for translation of SGML doc-
       uments to specific document formatting, typesetting, or word processing
       systems.	 In this respect, SGML is similar to the RTF (Rich  Text  For-
       mat) supported by many popular word processors, in that it can serve as
       an intermediate language	for electronic document	exchange; several lan-
       guage  translators between SGML and other text representations are men-
       tioned in the SEE ALSO section below.  Regrettably, there is wide vari-
       ation  in  the capabilities and document	models of current text format-
       ting systems, so	such translations  are	usually	 rough	approximations
       that may	require	substantial hand patching to make them truly satisfac-
       tory.

       HTML is a modest	subset of SGML,	with tag names apparently chosen  from
       SGML,  the  Free	Software Foundation's TeXinfo system (which in turn is
       modeled on the earlier Scribe document formatting  system),  and	 occa-
       sionally, also from LaTeX.

       html-pretty  is	written	in this	spirit:	it knows about the meaning and
       typical use of all standard HTML	tags, but  nothing  about  other  SGML
       DTDs.   However,	 the  style-file facility makes	it possible to prepare
       formatting rules	for any	SGML DTD, extending the	applicability of html-
       pretty  to  the entire world of SGML, provided a	tag normalizer such as
       sgmlnorm(1) or spam(1) is available to supply omitted tags, and	expand
       abbreviated ones.  However, since SGML tag names	depend on the specific
       DTD, and	DTDs tend to be	proprietary, html-pretty is not	packaged  with
       pre-written style files for SGML.

       Contributions  of  suitable  style files	for public SGML	DTDs, together
       with those DTDs,	are hereby solicited, and they may be included in  fu-
       ture releases of	html-pretty.

PRETTYPRINTER IMPLEMENTATION LIMITS
       As  with	most computer software,	there are certain limitations in html-
       pretty on object	sizes, imposed by fixed	array dimensions or addressing
       limits  of  the	computer  hardware and operating system.  Here are the
       minimum values that all html-pretty implementations must	provide	in or-
       der  to	conform	to this	documentation; implementations on some systems
       may have	much more generous limits.

	      2048 characters in single	words, tag names, and filenames	 (this
	      must  be	at  least as large as the LITLEN limit set in the SGML
	      parser declaration file html.decl);

	      100 levels of list and environment  nesting  (this  must	be  at
	      least as large as	the TAGLVL limit set in	the SGML parser	decla-
	      ration file html.decl);

	      6	simultaneously open files (stdin, stderr, and stdout, plus the
	      style  catalog  file, and	two style files, allowing at least two
	      levels of	style file nesting).

       These are ample for any realistic document: they	 support  the  longest
       legal file paths	in all major current operating systems,	World-Wide Web
       URLs, and HTML tags named after 58-letter Welsh	towns  like  Llanfair-
       pwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch, yet will still work
       on the smallest personal	computer operating systems.

       There is	no limit on the	size of	input or output	files and lines, other
       than  that  imposed  by physical	storage	limits of the host file	system
       and the computer	address	space.

SEE ALSO
       amaya(1), arena(1), chimera(1), emacs(1), expand(1),  grail(1),	hotja-
       va(1),	html-check(1),	 html-ncheck(1),  html-norm(1),	 html-spam(1),
       html2latex(1),  htmlchek(1),  jde(1),  latex(1),	  latex2html(1),   la-
       tex2rtf(1),  lisp(1),  lynx(1),	man2html(1),  netscape(1),  nsgmls(1),
       panorama(1),   rman(1),	 RosettaMan(1),	  rtf2LaTeX(1),	  rtf2html(1),
       rtf2tex(1),  rtflatex(1),  scribe(1),  sgmlnorm(1),  sgmls(1), spam(1),
       tex(1), tex-pretty(1), texi2html(1),  texi2roff(1),  texinfo(1),	 unex-
       pand(1),	xmosaic(1).

       The ISO 8879 SGML Standard is contained in the book

	      Charles F. Goldfarb and Yuri Rubinsky
	      The SGML Handbook
	      Cambridge	University Press
	      1990
	      xxiv + 663 pp.
	      ISBN 0-19-853737-9
	      LCCN Z286.E43 G64	1990

       That  book  serves  as  the `scriptures'	of SGML; it even has long blue
       ribbons attached	to serve as page marks!

       References to nearly 300	books and over 1000 other  publications	 about
       SGML can	be found at these World-Wide Web locations:

	      ftp://ftp.math.utah.edu/pub/tex/bib/index.html#sgml
	      http://sgml.sgmlopen.org/
	      http://www.sil.org/sgml/sgml.html
	      http://www.falch.no/people/pepper/sgmltool/

       SGML software repositories are available	at:

	      http://sgml.sgmlopen.org/
	      ftp://ftp.math.utah.edu/pub/sgml

       The  latter has source and binary distributions for several of the SGML
       tools mentioned at the start of this section, including	html-check(1),
       html-ncheck(1),	 html-pretty,  html-spam(1),  man2html(1),  nsgmls(1),
       sgmlnorm(1), sgmls(1), and spam(1).

AUTHOR
       Nelson H. F. Beebe, Ph.D.
       Center for Scientific Computing
       University of Utah
       Department of Mathematics, 105 JWB
       155 S 1400 E RM 233
       Salt Lake City, UT 84112-0090
       Tel: +1 801 581 5254
       FAX: +1 801 581 4148
       Email: beebe@math.utah.edu, beebe@acm.org, beebe@ieee.org (Internet)
       WWW URL:	http://www.math.utah.edu/~beebe

AVAILABILITY
       html-pretty is freely available;	its master distribution	can  be	 found
       at

	      ftp://ftp.math.utah.edu/pub/sgml/

       in  the	file  htmlpty-x.yy.tar.gz  where  x.yy is the current version.
       Other distribution formats are usually available	in the same  location.
       Several other SGML and HTML tools are available in that same directory.

       That  site  is  mirrored	to several other Internet archives, so you may
       also be able to find it elsewhere on the	Internet;  try	searching  for
       the string htmlpty at one or more of the	popular	Web search sites, such
       as

	      http://altavista.digital.com/
	      http://www.hotbot.com/
	      http://www.stpt.com/
	      http://www.yahoo.com/

Version	1.00		       04 December 1997			HTML-PRETTY(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FORMATTING CONVENTIONS | STYLE FILES | CATALOG DIRECTORY | COMMENTS IN HTML AND SGML | HTML GRAMMAR CONSTRAINTS | PRETTYPRINTER LIMITATIONS | PRETTYPRINTER IMPLEMENTATION LIMITS | SEE ALSO | AUTHOR | AVAILABILITY

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