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How to find all the List elements that contain a particular value using XPath and XSLT?

I'm not sure if this is an XSL or XPath question. It has to do with the type. In the schema I have...

a simple type:

   <xs:simpleType name="doubleListType">
     <xs:list itemType="xs:int" />

I also have an element: <xs:element name="root"> <xs:complexType> <xs:all> <xs:element name="Lists" minOccurs="0"> <xs:complexType> <xs:sequence> <xs:element name="L" type="intListType" maxOccurs="unbounded" /> </xs:sequence> </xs:complexType> </xs:element> </xs:all> </xs:complexType> </xs:element>

What I want is to be able to find all the List <L> elements that contain a particular value. I can seach for element values, but not values within a list. I would like to output this to XML, which I think, means I cannot use script commands, but I may be wrong there! Any help would be fantasic!!
You can do this with XSLT and XPath (which is embedded into XSLT) using something like this:

<xsl:template match="L">
         <xsl:value-of select="."/>
         <xsl:if test="test for value goes here">
                 <xsl:text>Output the number here</xsl:text>

This was last published in June 2002

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