Cand XSLT evaluate XPath in String variable?

[Son KwonNam]

In XSLT, is this possible to get value from xml using XPath
which is in XSLT variable?

I mean XPath strings can be dynamic while XSL Transforming.

If possible, How??

Because I'm not a native English speaker, it's quite hard
to make the problem clear. Please see the following example.

There are two XML files.
One has data, and the other has xpath. I will transform
the XPath XML.

for example,

* XPath XML
<xpaths>
<xpath>/students/student/name</xpath>
<xpath>/students/student/id</xpath>
</xpaths>

* Data XML : data.xml
<students>
<student>
<name>John Doe</name>
<id>234234</id>
</student>
</students>

* XSL snippet.
<xsl:template match="//xpath">
<xsl:variable name="xpathstring" select="."/>
<B>XPaht : <xsl:value-of select="$xpathstring"/></B>
<B>Value : <xsl:value-of select="document('data.xml')/$xpathstring" />
</B> </xsl:template>


As you know, that <xsl:value-of select(document(bla...)/> line
does not
work.

Any solution for this problem in XSLT?
I use JDOM/Xalan for transforming.

Thanks,

 

[Joris Gillis]

Hi,

In XSLT, is this possible to get value from xml using XPath
which is in XSLT variable?

Any solution for this problem in XSLT?

This is not possible in XSLT1.0 (I don't know about 2.0), but you can work around it.

1) Use an extension function that evaluates a string as Xpath
e.g. 'dyn:evaluate' (http://www.exslt.org/dyn/functions/evaluate/index.html)
2) Use a two step tranformation

If you choose the second option, I could help - I have no experience whatsoever with the first option.

regards,

 

[Martin Honnen]

Son KwonNam wrote:

Any solution for this problem in XSLT?
I use JDOM/Xalan for transforming.

Xalan should support
<http://www.exslt.org/dyn/functions/evaluate/index.html>

 

[Son KwonNam]

Thank you.

It works perfectly.

I attach the dyn:evaluate example XSL for someone who has the same
problem as mine. With xalan, no need to do anything to use dyn:evaluate.
Just use.

----------------------------------------------------------------------
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"
xmlns:dyn="http://exslt.org/dynamic"
extension-element-prefixes="dyn"<xslutput method="xml"/>

<xsl:template match="/">
<ROOT>
<xsl:apply-templates />
</ROOT>
</xsl:template>

<xsl:template match="xpath">
<RESULT>
<XPATH><xsl:value-of select="."/></XPATH>
<xsl:variable name="xpathstr"
select="concat('document(&quot;data.xml&quot',.)"/>
<VALUE><xsl:value-of select="dyn:evaluate($xpathstr)"/></VALUE>
</RESULT>
</xsl:template>

</xsl:stylesheet>

 

[Joris Gillis]

With xalan, no need to do anything to use dyn:evaluate. Just use.
Really? Thanks for pointing that out.