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does xpath expressions/matches support variables?

From: stoj@-----------.---------.---
To: NULL
Date: 6/3/2006 4:38:00 PM


I need to use a variable (similar scenario also for a template parameter) 
that has been assigned with an xpath string as an xpath expression/match for 
xsl elements such as xsl:if, xsl:what, xsl:template, etc.

Eg. xsl snippet - intended to invoke execute-code block if the node exists.  
It works perfectly if i replace "$var" with "/root/parent/child".

<xsl:variable name="var">/root/parent/child</xsl:variable>
<xsl:if test="$var">
...execute-code
</xsl:if>

1. Observed behaviour is that the if statement always fires.  Presumably 
because it is resolving to <xsl:if test="'/root/parent/child'">, which 
resolves to true.  If this is true, how can i change this to <xsl:if 
test="/root/parent/child">?  Is there a function availble to strip away the 
extra quotations?

2. Does anyone know of a *clean* design pattern to solve this?  Preferably 
one that i can call as a generic template/function to allow it to called at 
whim.

cheers
stoj

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does xpath expressions/matches support variables?