I'm experiencing a problem, and I'm hoping someone might shed some
light on a solution.

I'm trying to pass data to an externally registered function. For
example, this function returns the uppercase version of what was
passed to it.

This works:
<xsl:value-of select="foo:bar('test')"/>

This doesn't:
<xsl:value-of select="foo:bar(element/.)"/>

Is it not possible to give XPath expressions as argument? I've tried
storing the content in both a param and a variable before sending it
on to the function. E.g.
<xsl:variable name="foo">
  This is a string.
</xsl:variable>
<xsl:value-of select="foo:bar($foo)"/>

...which also fails. The error I'm getting from libxslt is:
xmlXPathCompiledEval: evaluation failed
runtime error: file xsl/function.xsl element value-of
xsltValueOf: text copy failed

What am I doing wrong? Am I trying to go beyond the capabilities of
XSLT?

--
Jesper Nxhr, Information Systems Developer, Opera Software
tel: +47-24164348 / cell: +47-93460263 / jespern@xxxxxxxxx