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FRONTEND-SPEC(7)					      FRONTEND-SPEC(7)

NAME
       frontend-spec - interface between jw and	its frontends

DESCRIPTION
       jw(1)  calls  frontends	like frontends/docbook to get the informations
       specific	to a given input format. The frontend knows which  information
       to  return from the first command line parameter. It gets all necessary
       data via	environment variables ready to use.

       This document describes that command line parameter and those  environ-
       ment variables.

       The frontend should return 0 if there weren't any problem, and return a
       positive	value otherwise.

VARIABLES
		 $1
	      The command line parameter, specifying which information to  re-
	      turn. It can take	the following values:

	      centralized-catalog
		     The  frontend  must  return  the DTD-specific centralized
		     catalog name.  Centralized	catalogs  normally  reside  in
		     /etc/sgml	and  provide  the  location of all the catalog
		     files useful for handling this input  type	 (the  catalog
		     for the DTD, the catalog for the stylesheets, the catalog
		     for the entities,

	      style-sheet
		     The frontend must return the filename of the style	 sheet
		     to	 be  used  for	this document type and with the	chosen
		     backend.

		 SGML_CATALOGS_DIR
	      The directory where the centralized catalogs reside. It is  nor-
	      mally /etc/sgml.

	      (This  variable  is valid	only while determining the centralized
	      catalog to use.)

		 SGML_BASE_DIR
	      The  base	 directory  of	the  SGML  system.  It	 is   normally
	      /usr/share/sgml.

	      (This  variable  is valid	only while determining the style sheet
	      to use.)

		 SGML_FILE
	      The name of the file to convert.

	      (This variable is	valid only while determining  the  centralized
	      catalog to use.)

		 SGML_TYPE
	      The type of the backend to use, whether it produces output files
	      to be displayed online or	to be printed out.  It	can  take  the
	      value html or print.

	      (This  variable  is valid	only while determining the style sheet
	      to use).

		 SGML_STYLESHEETS
	      The desired custom stylesheet type, either none or default.   If
	      none,  the frontend must return the file name of the style sheet
	      provided by the system beneath the docbook-utils.	  If  default,
	      the  frontend  must return the custom stylesheet provided	by the
	      docbook-utils.

	      (This variable is	valid only while determining the  style	 sheet
	      to use).

		 SGML_XML
	      The metalanguage of the file to convert, either sgml or xml.

	      (This  variable  is valid	only while determining the centralized
	      catalog to use).

FILES
SEE ALSO
       backend-spec(7)

AUTHORS
       Jochem Huhmann <joh@revier.com>

			       11 February 2004		      FRONTEND-SPEC(7)

NAME | DESCRIPTION | VARIABLES | FILES | SEE ALSO | AUTHORS

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