Subject: Re: [xsl] Need an XPath expression for: $B is not contained in $A From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 14 Jun 2018 13:38:26 -0000 |
> On 14 Jun 2018, at 14:23, Eliot Kimber ekimber@xxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > This seems to work: > > <test>b1 in A: <xsl:value-of select="$B1/ancestor::* = $A"/></test> > <test>b2 in A: <xsl:value-of select="$B2/ancestor::* = $A"/></test> Unfortunately that's a bug that can go undetected for a long time. You're comparing the string-values of the two nodes, not their node identity. It will usually give the right answer, but (a) getting the string value of a node that's near the root of the tree can be very expensive (b) two nodes can have the same string value without being the same node Michael Kay Saxonica
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