<RefEntry id="descendant-ofX3F">
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<?html-filename descendant-of-p.html>

<RefMeta>
  <RefEntryTitle>descendant-of?</RefEntryTitle>
  <RefMiscInfo Role="file">dblib.dsl</RefMiscInfo>
</RefMeta>

<RefNameDiv>
  <RefName>descendant-of?</RefName>
  <RefPurpose>Returns true if the child is some descendant of the specified node</RefPurpose>
</RefNameDiv>

<RefSynopsisDiv><Title>Synopsis</Title>
<Synopsis>
(descendant-of? ancestor child)
</Synopsis>
</RefSynopsisDiv>

<RefSect1><Title>Description</Title>

<para>
Returns <literal>#t</literal> if <literal>child</literal> is a descendant of <literal>ancestor</literal>.</para>


</RefSect1>

<RefSect1><Title>Author</Title>

<para>
Norman Walsh, &lt;ndw@nwalsh.com&gt;
</para>
</RefSect1>
<RefSect1><Title>Source Code</Title>

<ProgramListing>
(define (descendant-of? ancestor child)
  ;; Returns true if the child is some descendant of the specified node
  (let loop ((c child))
    (if (node-list-empty? c)
	#f
	(if (node-list=? ancestor c)
	    #t
	    (loop (parent c))))))
</ProgramListing>
</RefSect1>

</RefEntry>
