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I suspect Michael just posted something equivalent or better or whatever
but
<x> <b id="i1">aaa</b> <b idref="i1"/> <b id="i2">kkk <c idref="i3"/></b> <b> aaa <c idref="i2"/></b> <b id="i3"> aaa <c idref="i2"/></b> </x> processed with <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:key name="id" match="*[@id]" use="@id"/> <xsl:template match="*"> <xsl:copy> <xsl:copy-of select="@* except @idref"/> <xsl:apply-templates select="@idref,node()"/> </xsl:copy> </xsl:template> <xsl:template match="@idref">
<xsl:param name="seen" tunnel="yes"/>
<xsl:choose>
<xsl:when test=".=$seen"><xsl:copy-of select="."/>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="key('id',.)">
<xsl:with-param name="seen" select="$seen,string(.)" tunnel="yes"/>
</xsl:apply-templates>
</xsl:otherwise>
</xsl:choose>
</xsl:template></xsl:stylesheet> produces $ saxon9 aaa.xml aaa.xsl <?xml version="1.0" encoding="UTF-8"?><x> <b id="i1">aaa</b> <b><b id="i1">aaa</b></b> <b id="i2">kkk <c><b id="i3"> aaa <c><b id="i2">kkk <c idref="i3"/></b></c></b></c></b> <b> aaa <c><b id="i2">kkk <c><b id="i3"> aaa <c idref="i2"/></b></c></b></c></b> <b id="i3"> aaa <c><b id="i2">kkk <c><b id="i3"> aaa <c idref="i2"/></b></c></b></c></b> </x> where idrefs have been expanded out unless you are already in the the descendants of its expansion in which case it is left as a ref. David
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