Re: [xsl] Trouble matching only elements with a specific combination of attributes in a child element.

[Joerg Heinicke <joerg.heinicke@xxxxxx>]

Hello Bennett,

> <xsl:template match="object[metadata/app_data/@name = 'Type' and
>                             metadata/app_data/@value = 'RFI']">

the above does not work like you expect it, because both expressions in 
the predicate are evaluated separately. So it is searched for a 
metadata/app_data, where the @name is 'Type', and one metadata/app_data, 
where @value is 'RFI'. Both can be found in both objects.

You must refer the @name and @value to the same app_data:

<xsl:template match="object[metadata/app_data[@name = 'Type' and [@value 
= 'RFI']]">

Regards,

Joerg

Bennett Smith wrote:
> Hello,
>
> I have an xml file that is structured something like 
>
> <?xml version="1.0" encoding="UTF-8"?>
> <root>
> 	<object id="00125">
> 		<metadata>
> 			<app_data name="Type" value="RFI"/>
> 			<app_data name="Version_Major" value="1"/>
> 		</metadata>
> 	</object>
> 	<object id="00126">
> 		<metadata>
> 			<app_data name="Type" value="Video"/>
> 			<app_data name="Category" value="RFI"/>
> 		</metadata>
> 	</object>
> </root>
>
> I am trying to build a style sheet that will match object elements that
> contain a child app_data element where the app_data element has a name
> of "Type" and a value of "RFI".  Here is the style sheet I am trying to
> use.  It has a problem that I cannot figure out.  It matches any object
> that has any app_data with a name of "Type" and with any other app_data
> with a value of "RFI".  As a result, both of the objects in my sample
> XML file are matched.  I could use some help with creating the Xpath
> expression to matchin only the first object.
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
> 	<xsl:output method="xml" version="1.0" encoding="UTF-8"
> indent="yes"/>
> 	
> 	<xsl:template match="/">
> 		<xsl:element name="Assets">
> 			<xsl:apply-templates/>
> 		</xsl:element>
> 	</xsl:template>
> 	
> 	<xsl:template match="object[metadata/app_data/@name = 'Type' and
> metadata/app_data/@value = 'RFI']">
> 		<xsl:element name="Asset">
> 			<xsl:value-of select="@id"/>
> 		</xsl:element>
> 	</xsl:template>
> 	
> </xsl:stylesheet>
>
> Many thanks.
>
> -- Bennett


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