XOM API for Processing XML with Java

[Christoph LANGE <ch.lange AT jacobs-university.de>]

On Friday 22 February 2008 04:12:40 Elliotte Harold wrote:
> Christoph LANGE wrote:
> > Dear XOM developers, dear Saxon developers,
> >
> >   sorry for crossposting, but this bug is actually related to both XOM
> > and Saxon. As far as I can judge on that, Saxon generates DOM output that
> > is not completely valid and makes XOM's DOMConverter crash.
>
> I'll need to think about this one. However a elf-contained test case
> would be very helpful in figuring out exactly what's going on and whose
> problem it is.

Please see the attached files. In order to run them, make sure that XOM and 
Saxon and the current directory are in the classpath, e.g.

java -cp 
.:path/to/xom-1.2b2.jar:path/to/saxon/saxon9.jar:path/to/saxon/saxon9-dom.jar 
TransformXOMSaxon

Now, after factoring this code out of my project, I was not able to reproduce 
exactly the bug I reported, but a similar one:

Error on line 52
  Error in call to extension function {public static java.lang.String
  XSLTFunctions.render(org.w3c.dom.NodeList)}: Exception in extension function
  nu.xom.NamespaceConflictException: Prefixed elements must have namespace 
URIs.
Exception in thread "main" ; SystemID: ; Line#: 52; Column#: -1
net.sf.saxon.trans.XPathException: Error in call to extension function 
{public 
static java.lang.String XSLTFunctions.render(org.w3c.dom.NodeList)}: 
Exception in extension function nu.xom.NamespaceConflictException: Prefixed 
elements must have namespace URIs.
        at 
net.sf.saxon.functions.ExtensionFunctionCall.iterate(ExtensionFunctionCall.java:151)
        at net.sf.saxon.expr.Expression.evaluateItem(Expression.java:352)
        at net.sf.saxon.expr.Expression.process(Expression.java:461)
        at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:401)
        at net.sf.saxon.instruct.Instruction.process(Instruction.java:94)
        at 
net.sf.saxon.instruct.ElementCreator.processLeavingTail(ElementCreator.java:298)
        at net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:175)
        at 
net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:343)
        at 
net.sf.saxon.instruct.ApplyTemplates.defaultAction(ApplyTemplates.java:376)
        at 
net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:331)
        at net.sf.saxon.Controller.transformDocument(Controller.java:1735)
        at net.sf.saxon.Controller.transform(Controller.java:1559)
        at TransformXOMSaxon.main(TransformXOMSaxon.java:27)
Caused by: nu.xom.NamespaceConflictException: Prefixed elements must have 
namespace URIs.
        at nu.xom.Element._setNamespaceURI(Element.java:864)
        at nu.xom.Element.<init>(Element.java:109)
        at nu.xom.NodeFactory.startMakingElement(NodeFactory.java:127)
        at nu.xom.converters.DOMConverter.makeElement(DOMConverter.java:519)
        at nu.xom.converters.DOMConverter.convert(DOMConverter.java:450)
        at nu.xom.converters.DOMConverter.convert(DOMConverter.java:443)
        at XSLTFunctions.convert(XSLTFunctions.java:19)
        at XSLTFunctions.render(XSLTFunctions.java:26)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
net.sf.saxon.functions.ExtensionFunctionCall.invokeMethod(ExtensionFunctionCall.java:533)
        at 
net.sf.saxon.functions.ExtensionFunctionCall.call(ExtensionFunctionCall.java:256)
        at 
net.sf.saxon.functions.ExtensionFunctionCall.iterate(ExtensionFunctionCall.java:147)
        ... 12 more
---------
nu.xom.NamespaceConflictException: Prefixed elements must have namespace URIs.
        at nu.xom.Element._setNamespaceURI(Element.java:864)
        at nu.xom.Element.<init>(Element.java:109)
        at nu.xom.NodeFactory.startMakingElement(NodeFactory.java:127)
        at nu.xom.converters.DOMConverter.makeElement(DOMConverter.java:519)
        at nu.xom.converters.DOMConverter.convert(DOMConverter.java:450)
        at nu.xom.converters.DOMConverter.convert(DOMConverter.java:443)
        at XSLTFunctions.convert(XSLTFunctions.java:19)
        at XSLTFunctions.render(XSLTFunctions.java:26)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at 
net.sf.saxon.functions.ExtensionFunctionCall.invokeMethod(ExtensionFunctionCall.java:533)
        at 
net.sf.saxon.functions.ExtensionFunctionCall.call(ExtensionFunctionCall.java:256)
        at 
net.sf.saxon.functions.ExtensionFunctionCall.iterate(ExtensionFunctionCall.java:147)
        at net.sf.saxon.expr.Expression.evaluateItem(Expression.java:352)
        at net.sf.saxon.expr.Expression.process(Expression.java:461)
        at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:401)
        at net.sf.saxon.instruct.Instruction.process(Instruction.java:94)
        at 
net.sf.saxon.instruct.ElementCreator.processLeavingTail(ElementCreator.java:298)
        at net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:175)
        at 
net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:343)
        at 
net.sf.saxon.instruct.ApplyTemplates.defaultAction(ApplyTemplates.java:376)
        at 
net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:331)
        at net.sf.saxon.Controller.transformDocument(Controller.java:1735)
        at net.sf.saxon.Controller.transform(Controller.java:1559)
        at TransformXOMSaxon.main(TransformXOMSaxon.java:27)

This is again because the namespace node xmlns:m on the m:apply element is 
misrepresented as an attribute.

Hope that helps,

Christoph

-- 
Christoph Lange, Jacobs Univ. Bremen, http://kwarc.info/clange, Skype duke4701