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XSLT evaluate XPath from a string

From: Mycroft@-----------.---------.---
To: NULL
Date: 8/19/2008 1:19:00 PM


I need to pull XPath from strings obtained from the XML data source. A 
typical query might look like:

XML:
<library>
	<books>
		<book title="A" type="science fiction"/>
		<book title="B" type="fantasy"/>
		<book title="C" type="romance"/>
		<book title="D" type="science fiction"/>
		<book title="E" type="Christianity"/>
	</books>
	<librarian>
		<defaultXPath>//book[type="Christianity"]</defaultXPath>
	</librarian>
</library>

XSLT (works):
<xsl:variable name="Books">
	<xsl:apply-templates select="//book[type="Christianity"]"/>
</xsl:variable>

XSLT (fails):
	<xsl:apply-templates select="//librarian/defaultXPath"/>
	<xsl:apply-templates select="{//librarian/defaultXPath}"/>


The problem is that the apply-templates command process the string as a data 
island rather than interpreting the string as an XPath query.

I have tried using code from EXSLT but that has not worked and everything I 
read suggests that XSLT 2.0 might have a method to perform this operation, 
but I find no examples.

Any suggestions?

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