RE: [xsl] Problem setting part of xpath as parameter

["Michael Kay" <mhk@xxxxxxxxx>]

> 
> Im having a problem with a parameter set from java to a xsl document.
> It used to work. But moving from version Xalan Java 1 to 
> Xalan Java 2  it 
> doesnt anymore.


The only thing that surprises me is that this could ever have worked.

> 
> I have the following Java testcode, that makes the transformation:

>           trans.setParameter("xpath", "Root[1]/Niv0[1]/Niv1[1]/");
> 
> in the xsl file I have the following:
> .
> .
> .
> <xsl:param  name="xpath" />
> .
> .
> <xsl:for-each 
> select="$xpath/child::node()[@Visible='true'].......more conditions...
> 
> Somehow it cant put the value of the xpath parameter in the select 
> statement and interpret it as a nodelist.

Well, you haven't actually told it that the string you supplied is an XPath
expression and you would like it to be evaluated and that when you say
$xpath you don't want the string, but the node-set that results from this
XPath evaluation. You can't really expect the processor to guess that this
is what you wanted! If you supply a string as a parameter, you should use it
in the stylesheet as a string.

Xalan, I believe, implements the EXSLT dyn:evaluate() extension that allows
you to evaluate an XPath expression supplied as a string, returning the
node-set containing the selected nodes. Alternatively, you could control
this evaluation from the Java application and supply a set of nodes as the
parameter value.


Michael Kay