To evaluate an XPath expression held as a string, you need an extension
function such as dyn:evaluate().

Saxon 8.2 has a new form of this function, saxon:evaluate-node(), designed
for use when the XPath expression is held in a source document: it's
different from saxon:evaluate() in that it takes the namespace context from
the node in which the expression appears.

Michael Kay
http://www.saxonica.com/
 

> -----Original Message-----
> From: michella@xxxxxxx [mailto:michella@xxxxxxx] 
> Sent: 31 December 2004 11:39
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Xpath as variable, then processing it
> 
> Hi all,
> 
> I have a little question :
> 
> I have a small XML Data containing in one of its field an Xpath (as
> text) which should be used in an XSL-T for querying data in 
> another XML
> using this XPath. The following XSL handles it as a variable.
> 
> <Classes>
> 	<Class>
> 		<Architecture name="Application" abr="AA">
> 			<xsl_File name="App_Apt_Apx_Applications" 
> 	
> file="App_Apt_Apx_Applications.xsl" 
> 	
> XPath="/Classes/Class/SADefinition[starts-with(@SAObjName,'app_') or
> starts-with(@SAObjName,'apx_') or starts-with(@SAObjName,'apt_')]"/>
> (...)
> 
> Then, the XSL file looks as follow :
> 
> <xsl:stylesheet version="1.1"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> 	<xsl:variable name="mainXML_node"
> select="document('../XML/PM-EA-AA_IA_PA_TA.xml')"/>     (The main XML)
> 	<xsl:output method="html" version="1.0" encoding="UTF-16"
> indent="yes"/>
> 	<xsl:template match="/">
> 		<xsl:result-document
> href="../TCL/Temp/TCL_Data_Config.tmp">
> 			<xsl:value-of disable-output-escaping="yes"
> select="'{'"/>
> 			<xsl:for-each-group
> select="/Classes/Class/Architecture" group-by="@name">
> 				<xsl:sort select="@name"/>
> 				<xsl:value-of
> disable-output-escaping="yes" select="concat('{',@name,' ')"/>
> 				<xsl:for-each-group select="xsl_File"
> group-by="@name">
> 					<xsl:sort select="@name"/>
> 					<xsl:variable name="path"
> select="@XPath"/>
> 					<xsl:value-of
> disable-output-escaping="yes" select="concat('{',@name,' ')"/>
> 					<xsl:for-each
> select="$mainXML_node">			(Here is the problem)
> 						<xsl:for-each-group
> select="$path" group-by="@SAObjName">
> 							<xsl:sort
> select="@SAObjName"/>
> (...)
> 
> 
> 
> I hope the upon the text is correctly indented by your mail browser.
> 
> Unfortunately, it won't work. Have anyone got an idea on how 
> to solve my
> problem?
> 
> Best regards
> 
> Lawrence