Subject: RE: XPath attribute expression
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Tue, 19 Dec 2006 15:37:20 -0000
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> So, I need a pure XPath expression -- probably XPath 1.0. Any ideas?
In general, XPath 1.0 doesn't have the expressive power to perform join
operations. You can probably do it in two steps: first bind a variable to
the value you are searching for, then do
/topLevel/ents/ent[@name=$name]/value
Michael Kay
http://www.saxonica.com/
>
>
> -----Original Message-----
> From: Alexey Nickolaenkov [mailto:nikolaenkov@xxxxxxxxxxxx]
> Sent: Tuesday, December 19, 2006 1:29 AM
> To: Hintz, David L
> Subject: Re: XPath attribute expression
>
> Tuesday, December 19, 2006, 2:27:52 AM, you wrote:
>
> HDL> Assume that my document has this structure:
>
> HDL> <topLevel>
> HDL> <ents>
> HDL> <ent name="abc"><value>test1</value></ent>
> HDL> <ent name="def"><value>test2</value></ent>
> HDL> </ents>
> HDL> .
> HDL> .
> HDL> .
> HDL> <para>This is a <entRef name="def"/>.</para>
>
> HDL> What XPath expression can I use in context of this
> <entRef> element
> to
> HDL> reference the content of the <value> element that
> matches the <ent>
> name
> HDL> attribute (as shown above). I've gotten this far:
>
> HDL> /topLevel/ents/ent[@name]/value
>
> HDL> But, that always returns the first value. Somehow I need to test
> @name
> HDL> that equals the "name" of the current tag.
>
> I think that problem is not in XPath but in templates. I
> suppose something like that will suit for you:
>
> <xsl:key name="ents-by-name" use="@name" match="//ents/ent"/>
>
> <xsl:template match="topLevel">
> <html>
> <head>
> <meta http-equiv="Content-Type"
> content="text/html; charset=windows-1251"/>
> <title>test</title>
> </head>
> <body>
> <xsl:apply-templates select="page"/>
> </body>
> </html>
> </xsl:template>
>
> <xsl:template match="para">
> <p><xsl:apply-templates select="@*|node()"/></p>
> </xsl:template>
>
> <xsl:template match="entRef">
> <xsl:variable name="ent-name"
> select="key('ents-by-name', @name)"/>
> <b>
>
> <xsl:choose>
> <xsl:when test="$ent-name">
> <xsl:value-of select="$ent-name"/>
> </xsl:when>
>
> <xsl:otherwise>
> <xsl:text/>Undefined ent
> </xsl:otherwise>
> </xsl:choose>
> </b>
> </xsl:template>
>
>
>
> --
> Alexey
> mailto:alexey.nikolaenkov@xxxxxxxxxxxx
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