RE: [xsl] Predicates using current node-set

Hi,

> I have a problem using predicate expressions where I compare 
> an attribute in
> the node-set to an attribute in the "current node-set". I 
> have problems
> explaing this, so here's an example:
> 
> xml file:
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <?xml-stylesheet type="text/xsl" href="paytest.xsl"?>
> <payments>
> 	<oldpayments>
> 		<oldpayment payno="1" amount="100" ref="a" />
> 		<oldpayment payno="2" amount="200" ref="b" />
> 		<oldpayment payno="3" amount="300" ref="c" />
> 	</oldpayments>
> 	<newpayments>
> 		<newpayment Payno="3" amount="300" />
> 		<newpayment Payno="4" amount="300" />
> 	</newpayments>
> </payments>
> 
> xsl file:
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
> <xsl:output method="html"/>
> 
> <xsl:template match="/">
> <html>
> <head><title>test</title></head>
> <body>
> <xsl:apply-templates select="/payments/newpayments/newpayment" />
> </body>
> </html>
> </xsl:template>
> 
> <xsl:template match="/payments/newpayments/newpayment">
> 	Payno: <xsl:value-of select="@Payno"/> 
> 	Amount: <xsl:value-of select="@amount"/>
> 	<xsl:if test="/payments/oldpayments/oldpayment/@payno = @Payno">
> 		Ref: <xsl:value-of
> select="/payments/oldpayments/oldpayment[@payno=@Payno]/@ref"/>
> 	</xsl:if>
> 	<br/>
> </xsl:template>
> 
> Result in browser:
> Payno: 3 Amount: 300 Ref: 
> Payno: 4 Amount: 300
> 
> I wanted the "ref" attribute to be printed, but I cant work 
> out how to match
> the oldpayment payno with the newpayment Payno

keys might make your stylesheet more readable and easier to maintain,

<xsl:key name="old" match="oldpayments/oldpayment" use="@payno" />

<xsl:template match="newpayment">
	Payno: <xsl:value-of select="@Payno"/> 
	Amount: <xsl:value-of select="@amount"/>
	<xsl:if test="key('old', @Payno)">
		Ref: <xsl:value-of select="key('old', @Payno)/@ref"/>
	</xsl:if>
	<br/>
</xsl:template>

But as Oleg said, using current() will get you there, too.

Cheers,

Jarno

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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