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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 return.  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 han‐
	      dling 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  normally
       /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>

				 27 April 2001		      FRONTEND-SPEC(7)

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