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+<refentry xmlns="http://docbook.org/ns/docbook"
+ xmlns:xlink="http://www.w3.org/1999/xlink"
+ xmlns:xi="http://www.w3.org/2001/XInclude"
+ xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
+ xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ version="5.0" xml:id="olink.lang.fallback.sequence">
+<refmeta>
+<refentrytitle>olink.lang.fallback.sequence</refentrytitle>
+<refmiscinfo class="other" otherclass="datatype">string</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>olink.lang.fallback.sequence</refname>
+<refpurpose>look up translated documents if olink not found?</refpurpose>
+
+</refnamediv>
+<refsynopsisdiv> <src:fragment xml:id="olink.lang.fallback.sequence.frag">
+<xsl:param name="olink.lang.fallback.sequence"></xsl:param>
+</src:fragment>
+</refsynopsisdiv>
+<refsection><info><title>Description</title></info>
+
+
+<para>This parameter defines a list of lang values
+to search among to resolve olinks.
+</para>
+
+<para>Normally an olink tries to resolve to a document in the same
+language as the olink itself. The language of an olink
+is determined by its nearest ancestor element with a
+<tag class="attribute">lang</tag> attribute, otherwise the
+value of the <parameter>l10n.gentext.default.lang</parameter>
+parameter.
+</para>
+
+<para>An olink database can contain target data for the same
+document in multiple languages. Each set of data has the
+same value for the <tag>targetdoc</tag> attribute in
+the <tag>document</tag> element in the database, but with a
+different <tag>lang</tag> attribute value.
+</para>
+
+<para>When an olink is being resolved, the target is first
+sought in the document with the same language as the olink.
+If no match is found there, then this parameter is consulted
+for additional languages to try.</para>
+
+<para>The <parameter>olink.lang.fallback.sequence</parameter>
+must be a whitespace separated list of lang values to
+try. The first one with a match in the olink database is used.
+The default value is empty.</para>
+
+<para>For example, a document might be written in German
+and contain an olink with
+<literal>targetdoc="adminguide"</literal>.
+When the document is processed, the processor
+first looks for a target dataset in the
+olink database starting with:</para>
+
+<literallayout><literal>&lt;document targetdoc="adminguide" lang="de"&gt;</literal>.
+</literallayout>
+
+<para>If there is no such element, then the
+<parameter>olink.lang.fallback.sequence</parameter>
+parameter is consulted.
+If its value is, for example, <quote>fr en</quote>, then the processor next
+looks for <literal>targetdoc="adminguide" lang="fr"</literal>, and
+then for <literal>targetdoc="adminguide" lang="en"</literal>.
+If there is still no match, it looks for
+<literal>targetdoc="adminguide"</literal> with no
+lang attribute.
+</para>
+
+<para>This parameter is useful when a set of documents is only
+partially translated, or is in the process of being translated.
+If a target of an olink has not yet been translated, then this
+parameter permits the processor to look for the document in
+other languages. This assumes the reader would rather have
+a link to a document in a different language than to have
+a broken link.
+</para>
+
+</refsection>
+</refentry>