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Posted to dev@xalan.apache.org by Didier VILLEVALOIS <dv...@techmetrix.net> on 2000/07/07 19:17:40 UTC
[Xalan-J] rtf-to-nodeset extension and namespace problems

Hi,

I'm trying to do a *result tree fragment to nodeset* extension function fo
Xalan. Here is my source code:

public class FunctionTree extends Function
{
	public XObject execute(XPath path, XPathSupport execContext, Node
context, int opPos, Vector args) 
	throws org.xml.sax.SAXException
	{
		if (args.size() == 0) return null;
		else if (args.size() > 1) return null;
    
		XObject arg = (XObject)args.elementAt(0);
		if (XObject.CLASS_RTREEFRAG == arg.getType())
		{
			XRTreeFrag xrtf = (XRTreeFrag)arg;
			return new XNodeSet(xrtf.convertToNodeset());
		}
		else return arg;
	}
 }

As you can see, it is very simple.
It looks like it works with a no-namespaces example:

<?xml version="1.0" encoding="UTF-8"?>
<?cocoon-process type="xslt"?>
<?xml-stylesheet href="core.xsl" type="text/xsl"?>
<foo>
	<bar/>
	<bar/>
	<bar/>
	<bar/>
	<bar/>
</foo>

with the stylesheet:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>

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

<xsl:template match="foo">
	<xsl:variable name="temp">
		<xsl:apply-templates/>
	</xsl:variable>
	
	<foo>
		<xsl:apply-templates select="tree($temp)"/>
	</foo>
</xsl:template>

<xsl:template match="bar">
	<toto titi="gato"/>
</xsl:template>

<xsl:template match="toto">
	<prout bato="{@titi}"/>
</xsl:template>

</xsl:stylesheet>

i get:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
"http://www.w3.org/TR/REC-html40/strict.dtd">
<foo>
        <prout bato="gato"></prout>
        <prout bato="gato"></prout>
        <prout bato="gato"></prout>
        <prout bato="gato"></prout>
        <prout bato="gato"></prout>
</foo>

<!-- This page was served from cache in 0 milliseconds by Cocoon 1.7.3 -->

But with a with-namespaces example:

<?xml version="1.0" encoding="UTF-8"?>
<?cocoon-process type="xslt"?>
<?xml-stylesheet href="core-with-ns.xsl" type="text/xsl"?>
<ns:foo xmlns:ns="http://fictive.org/schema">
	<ns:bar/>
	<ns:bar/>
	<ns:bar/>
	<ns:bar/>
	<ns:bar/>
</ns:foo>

and the stylesheet:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:ns="http://fictive.org/schema"
>

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

<xsl:template match="ns:foo">
	<xsl:variable name="temp">
		<temp>
			<xsl:copy-of
select="ancestor-or-self::*/namespace::*"/>
			<xsl:apply-templates/>
		</temp>
	</xsl:variable>
	
	<ns:foo>
		<xsl:apply-templates select="tree($temp)"/>
	</ns:foo>
</xsl:template>

<xsl:template match="ns:bar">
	<ns:toto titi="gato"/>
</xsl:template>

<xsl:template match="ns:toto">
	<ns:prout bato="{@titi}"/>
</xsl:template>

</xsl:stylesheet>

i get the folowing exceptions:

      java.lang.RuntimeException: xmlns:ns="http://fictive.org/schema"
Attribute child does not have an owner document element!
              at
org.apache.xalan.xpath.xml.XMLParserLiaisonDefault.getParentOfNode(XMLParser
LiaisonDefault.java:1283)
              at
org.apache.xalan.xpath.xml.XMLParserLiaisonDefault.getNamespaceOfNode(XMLPar
serLiaisonDefault.java:1149)
              at
org.apache.xalan.xpath.SimpleNodeLocator.nodeTest(SimpleNodeLocator.java:175
0)
              at
org.apache.xalan.xpath.SimpleNodeLocator.findAttributes(SimpleNodeLocator.ja
va:644)
              at
org.apache.xalan.xpath.SimpleNodeLocator.step(SimpleNodeLocator.java:396)
              at
org.apache.xalan.xpath.SimpleNodeLocator.locationPath(SimpleNodeLocator.java
:296)
              at org.apache.xalan.xpath.XPath.locationPath(XPath.java:964)
              at org.apache.xalan.xpath.XPath.execute(XPath.java:1385)
              at org.apache.xalan.xpath.XPath.execute(XPath.java:1354)
              at org.apache.xalan.xpath.XPath.execute(XPath.java:311)
              at org.apache.xalan.xpath.XPath.execute(XPath.java:274)
              at
org.apache.xalan.xslt.AVTPartXPath.evaluate(AVTPartXPath.java:109)
              at org.apache.xalan.xslt.AVT.evaluate(AVT.java:308)
              at
org.apache.xalan.xslt.ElemLiteralResult.execute(ElemLiteralResult.java:223)
              at
org.apache.xalan.xslt.ElemTemplateElement.executeChildren(ElemTemplateElemen
t.java:659)
              at
org.apache.xalan.xslt.ElemTemplateElement.transformChild(ElemTemplateElement
.java:1194)
              at
org.apache.xalan.xslt.ElemTemplateElement.transformSelectedChildren(ElemTemp
lateElement.java:957)
              at
org.apache.xalan.xslt.ElemApplyTemplates.execute(ElemApplyTemplates.java:176
)
	...

If i change:
	<xsl:variable name="temp">
		<xsl:apply-templates/>
	</xsl:variable>

by:
	<xsl:variable name="temp">
		<temp>
			<xsl:copy-of
select="ancestor-or-self::*/namespace::*"/>
			<xsl:apply-templates/>
		</temp>
	</xsl:variable>

this now works. But not with more complex examples.

What am i missing ????

I've seen the posts of Juergen and al. that were speaking of a similar
extension for XalanC.
Should i clone nodes ? Does anyone has allready done this ?? Any hints ??

Thanks for you help.
Didier.