Subject: Re: [xsl] XPath expression which expresses sequence-extended = (sequence, item) From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 21 Nov 2017 21:59:29 -0000 |
On 21 November 2017 at 13:08, Costello, Roger L. costello@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > David Carlisle wrote: > > > >> why? > > > > What I mean is that this expression: > > > > $sequence-extended/item = ($sequence/item, $item) > > > > returns false when $sequence is empty (and the other variables have the values I described). > > > > /Roger > > to give a reply of more than one word, the xpath you suggest returns true not false on both the examples you give: $ saxon9 -it:test seq1.xsl <?xml version="1.0" encoding="UTF-8"?> test1: true test2: true where seq1.xsl is <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template name="test"> <!-- Suppose that $sequence-extended has this value: --> <xsl:variable name="sequence-extended" as="element()"> <sequence> <item>A</item> <item>B</item> </sequence> </xsl:variable> <!-- And $sequence has this value: --> <xsl:variable name="sequence" as="element()"> <sequence> <item>A</item> </sequence> </xsl:variable> <!-- And $item has this value: --> <xsl:variable name="item" as="element()"> <item>B</item> </xsl:variable> test1: <xsl:value-of select="$sequence-extended/item = ($sequence/item, $item)"/> <!-- But, the XPath expression fails when $sequence is empty: --> <xsl:variable name="sequence" as="element()"> <sequence/> </xsl:variable> <!-- And $sequence-extended has a single item: --> <xsl:variable name="sequence-extended" as="element()"> <sequence> <item>A</item> </sequence> </xsl:variable> <!-- And $item is: --> <xsl:variable name="item" as="element()"> <item>A</item> </xsl:variable> test2: <xsl:value-of select="$sequence-extended/item = ($sequence/item, $item)"/> </xsl:template> </xsl:stylesheet>
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