[xslt] needed:set xslt variable in program



hello, guys
we plan to use libxml and libxslt  in our projects.
what we need are like snippet belows:
            <ActivityInput>
                <body>
                    <pfx:field>
                        <pfx:name>
                            <xsl:value-of
select="&quot;Data&quot;"/>
                        </pfx:name>
                        <pfx:id>
                            <xsl:value-of select="0"/>
                        </pfx:id>
                        <pfx:simple>
                            <xsl:value-of
select="string($var/Report/Data[1])"/>
                        </pfx:simple>
                    </pfx:field>
	 </body>
            </ActivityInput>
We want to use something like  xslt template to
produce some xml tree as process's input.
We can change this xml snippet to a xslt template and
use applystylesheet to produce expected output xml
tree.
However, we need to set a variable (named var ) in
program before apply the translation. 
Does libxslt have any method to do this ,for example
like xmlXPathRegisterVariable in libxml?

or any other thoughts?

thx


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