<refentry id="backend-spec">
  <docinfo>
    <author>
      <firstname>Jochem</firstname> <surname>Huhmann</surname>
      <affiliation>
        <address><email>joh@revier.com</email></address>
      </affiliation>
    </author>
  </docinfo>
  <refmeta>
    <refentrytitle>backend-spec</refentrytitle>
    <manvolnum>7</manvolnum>
  </refmeta>
  
  <refnamediv>
    <refname>backend-spec</refname>
    <refpurpose>interface between jw and its backends</refpurpose>
  </refnamediv>

  <refsect1>
    <title>Description</title>

    <para><citerefentry> <refentrytitle>jw</refentrytitle>
    <manvolnum>1</manvolnum> </citerefentry> calls backends like
    <filename>backends/html</filename> to do the "real" conversion
    work. The backend gets all necessary data delivered
    via environment variables ready to use.</para>

    <para>This documentation describes those environment variables.</para>

    <para>The backend is run in the directory where the output
    files are to be created. It should return 0 if there weren't any problem,
    and return a positive value otherwise.</para>

  </refsect1>

  <refsect1>
    <title>Variables</title>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_FILE_NAME</envar>
        </glossterm>
        <glossdef>
          <para>The bare name of the source file</para>
        </glossdef>
      </glossentry>
    </glosslist>

    <para></para>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_FILE</envar>
        </glossterm>
        <glossdef>
          <para>The full name and path of the source file</para>
        </glossdef>
      </glossentry>
    </glosslist>

    <para></para>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_JADE</envar>
        </glossterm>
        <glossdef>
          <para>The name of the parser (usually
          <application>Jade</application> or
          <application>OpenJade</application>)</para>
        </glossdef>
      </glossentry>
    </glosslist>

    <para></para>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_ARGUMENTS</envar>
        </glossterm>
        <glossdef>
          <para>The full argument-string for
          <application>Jade</application> or
          <application>OpenJade</application></para>
        </glossdef>
      </glossentry>
    </glosslist>

    <para></para>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_CATALOG_FILES</envar>
        </glossterm>
        <glossdef>
          <para>The list of catalog files needed by
          <application>Jade</application> or
          <application>OpenJade</application></para>
        </glossdef>
      </glossentry>
    </glosslist>

    <para></para>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_STYLESHEET</envar>
        </glossterm>
        <glossdef>
          <para>The style sheet to use</para>
        </glossdef>
      </glossentry>
    </glosslist>

    <para></para>

    <glosslist>
      <glossentry>
        <glossterm>
          <envar>SGML_BASE_DIR</envar>
        </glossterm>
        <glossdef>
          <para>The base directory of the SGML system (default is
          <filename>/usr/share/sgml</filename>)</para>
        </glossdef>
      </glossentry>
    </glosslist>

  </refsect1>

  <refsect1>
    <title>Files</title>

  <para></para>

  </refsect1>

  <refsect1>
    <title>See also</title>

    <para><citerefentry> <refentrytitle>frontend-spec</refentrytitle>
    <manvolnum>7</manvolnum> </citerefentry></para>

  </refsect1>

  <refsect1>
    <title>Authors</title>

    <para>Jochem Huhmann <email>joh@revier.com</email></para>

  </refsect1>


</refentry>