Extension function question

Given
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
      xmlns="http://www.w3.org/TR/REC-html40"

xmlns:myjava="http://www.jclark.com/xt/java/TestMyJava">



<xsl:template name="callme">

<xsl:param-variable name="str">Hello
World</xsl:param-variable>
<xsl:value-of select="myjava:callme(????????)"/>
</xsl:template>

Then
<xsl:call-template name="callme"/>

With the java method having a parameter of type
<methinks>String</methinks>

I have tried various options to get a match between the java
and the ????? entry.
  My first thought was $str, but xt or the java objects.
   Is it a (java) String, and array of bytes.... Null
terminated string..


Any help appreciated.
(by email please, I only get the digest)

DaveP.



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