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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="refentry.source.fallback.profile">
+<refmeta>
+<refentrytitle>refentry.source.fallback.profile</refentrytitle>
+<refmiscinfo class="other" otherclass="datatype">string</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>refentry.source.fallback.profile</refname>
+<refpurpose>Specifies profile of "fallback" for refentry "source" data</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment xml:id="refentry.source.fallback.profile.frag">
+<xsl:param name="refentry.source.fallback.profile">
+refmeta/refmiscinfo[not(@class = 'date')][1]/node()</xsl:param>
+</src:fragment>
+</refsynopsisdiv>
+
+<refsection><info><title>Description</title></info>
+
+<para>The value of
+<parameter>refentry.source.fallback.profile</parameter> is a string
+representing an XPath expression. It is evaluated at run-time and used
+only if no "source" data can be found by other means (that is, either
+using the <tag>refentry</tag> metadata-gathering logic "hard coded" in
+the stylesheets, or the value of the
+<parameter>refentry.source.name.profile</parameter> and
+<parameter>refentry.version.profile</parameter> parameters, if those
+are enabled).</para>
+
+<important>
+<para>Depending on which XSLT engine you run, either the EXSLT
+<function>dyn:evaluate</function> extension function (for xsltproc or
+Xalan) or <function>saxon:evaluate</function> extension function (for
+Saxon) are used to dynamically evaluate the value of
+<parameter>refentry.source.fallback.profile</parameter> at
+run-time. If you don't use xsltproc, Saxon, Xalan -- or some other
+XSLT engine that supports <function>dyn:evaluate</function> -- you
+must manually disable fallback processing by setting an empty value
+for the <parameter>refentry.source.fallback.profile</parameter>
+parameter.</para>
+</important>
+
+</refsection>
+</refentry>