frontend-spec

       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 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.


                 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>

                                29 October 2012               FRONTEND-SPEC(7)
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