This doesn't get quite the result you ask for I get ../bat for the last
one, also I assume that nodes without a name should not contribute to
the path (otherwise I'd need an extra ../ to get out of the unnamed
node that contains c2).
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:f="data:,f">
<xsl:key name="id" match="*" use="@id"/>
<xsl:variable name="r" select="/"/>
<xsl:template match="/">
a3 to b3 <xsl:value-of select="f:path('a3','b3')"/>
c3 to b3 <xsl:value-of select="f:path('c3','b3')"/>
b4 to b3 <xsl:value-of select="f:path('b4','b3')"/>
</xsl:template>
<xsl:function name="f:path">
<xsl:param name="a"/>
<xsl:param name="b"/>
<xsl:variable name="an" select="key('id',$a,$r)"/>
<xsl:variable name="bn" select="key('id',$b,$r)"/>
<xsl:value-of>
<xsl:sequence select="($an/ancestor-or-self::node[(_at_)name] except
$bn/ancestor::node)/'../'"/>
<xsl:value-of separator="/" select="($bn/ancestor-or-self::node[(_at_)name]
except $an/ancestor::node)/@name"/>
</xsl:value-of>
</xsl:function>
</xsl:stylesheet>
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