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Mark Spittle

Subject: Native Java types and extension functions
Author: Mark Spittle
Date: 18 May 2006 03:58 AM

I have written some extension functions in Java, one of these returns a Vector of a class defined within the extension function class.

I yould like to iterate over this vector in xsl, passing each member of the vector to a tremplate as a param. Then call other extension functions to get information out of the Java class.

Something like this

<xsl:for-each select="mynamespace:my-function( node ) >
<xsl:call-template name="xxxxxxxxxx">
<xsl:with-param name="abc" select="."/>
</xsl
</xsl

<xsl:template name="xxxxxxxxxx">
<xsl:param name="abc"/>
<xsl:element name="Item" use-attribute-sets="Detail">
<xsl:attribute name="yyy">
<xsl:value-of select="mynamespace:my-second-function($abc)"/>
</xsl:attribute>
</xsl
</xsl
</xsl

my-function takes a NodeSet and returns a Vector of items
my-second-funcction takes an item and returns a String

This works nicely with Saxone but fails with xalan with a message

"SystemId Unknown; Line #0; Column #0; Can not convert #UNKNOWN (java.util.Vector) to a NodeList!"

Any help would be appreciated.

Tony Lavinio

Subject: Native Java types and extension functions
Author: Tony Lavinio
Date: 18 May 2006 03:17 PM

Since callouts to non-XSLT extensions functions aren't specified in
the standard, each processor uses its own mechanisms.

In other words, what works for Saxon doesn't necessarily work for
Xalan.

See http://xml.apache.org/xalan-j/extensions.html#ext-functions
to see which datatypes are supported when calling into, and
http://xml.apache.org/xalan-j/extensions.html#ext-func-retval for
which types are used when returning values from Java when in Xalan.

And notice, sadly, that java.util.Vector is not among them.

Mark Spittle

Subject: Native Java types and extension functions
Author: Mark Spittle
Date: 19 May 2006 03:55 AM

I saw that and assumed that java.util.Vector came under the "All Other Classes" category. I sort of expected that Xalan would have treated a "Non-XSLT Type" to be a java.lang.Object.

What I find strange is that Xalan seems to be quite happy accepting a Vector into a variable. However, when I try and pass that variable back into an extension function, it has become a NodeSet.

Maybe I'm just trying to use xslt beyond its scope. I have some XML which I need to enhance with data picked up from an external data source but selected according to rules embedded the xml data. XSLT Seemed like a good idea at the time.

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