XOM API for Processing XML with Java

[Jim Downing <ojd20 AT cam.ac.uk>]

Elliotte Harold wrote:

> Jim Downing wrote:
>
> > Hi all,
> >
> > in trying to move from the default Builder to one that uses a 
> > ResolvingXMLReader I've come across an error I can't figure out. I'm 
> > pretty sure it's not a XOM problem, but unfortunately don't 
> > understand what's going on well enough to figure out where the 
> > problem _is_ arising.
>
>
> As I recall, that library did not handle namespaces correctly. There 
> may be a more recent version in CVS that does. If you can reduce it to 
> a self-contained test case, I may be able to provide more detailed 
> instructions.

The attached test case throws the exception.

The exception is thrown whether or not the catalog is enabled and 
present. Removing the <script/> element from the xhtml fragment makes 
the test pass.  The exception trace: -

nu.xom.ParsingException: Wrong namespace URI for xml prefix:
   at nu.xom.Builder.build(Builder.java:1142)
   at nu.xom.Builder.build(Builder.java:1019)
   at 
nu.xom.tests.ResolvingBuilderTest.testResolvingBuilder(ResolvingBuilderTest.java:29)
   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:585)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at junit.framework.TestSuite.runTest(TestSuite.java:208)
   at junit.framework.TestSuite.run(TestSuite.java:203)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:474)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:342)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:194)
Caused by: nu.xom.NamespaceConflictException: Wrong namespace URI for 
xml prefix:
   at nu.xom.Attribute._setNamespace(Attribute.java:495)
   at nu.xom.Attribute.<init>(Attribute.java:168)
   at nu.xom.NodeFactory.makeAttribute(NodeFactory.java:253)
   at nu.xom.XOMHandler.startElement(XOMHandler.java:161)
   at 
org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:527)
   at 
org.apache.xml.resolver.tools.ResolvingXMLFilter.startElement(Unknown 
Source)
   at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown 
Source)
   at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown 
Source)
   at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown 
Source)
   at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown 
Source)
   at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown 
Source)
   at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
   at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
   at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
   at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
   at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:333)
   at org.apache.xml.resolver.tools.ResolvingXMLFilter.parse(Unknown 
Source)
   at nu.xom.Builder.build(Builder.java:1125)
... 17 more

Going through the self contained test case has (as per) helped me 
understand more: "Script" is the only element in the xhtml fragment 
whose description in the XHTML DTD contains an xml prefixed attribute 
(xml:space).

Thanks for the help,
jim

package nu.xom.tests;

import java.io.StringReader;

import nu.xom.Builder;

import org.apache.xml.resolver.tools.ResolvingXMLReader;

public class ResolvingBuilderTest extends XOMTestCase {

        public ResolvingBuilderTest(String name) {
                super(name);
        }

        public void testResolvingBuilder() throws Exception {
                try {
                        String xhtml = "<!DOCTYPE html PUBLIC \"-//W3C//DTD 
XHTML 1.0 Transitional//EN\" "
                                        + 
"\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\";>\n"
                                        + "<html 
xmlns=\"http://www.w3.org/1999/xhtml\";>\n"
                                        + "<head>\n"
                                        + "<script type=\"text/javascript\" 
src=\"js/fsmenu.js\">/* */</script>"
                                        + "<title>Test</title>\n"
                                        + "</head>\n"
                                        + "<body>\n"
                                        + "<div id=\"banner\"/>" + 
"</body>\n" + "</html>";
                        StringReader in = new StringReader(xhtml);
                        // System.setProperty("xml.catalog.files", 
"catalog.xml");
                        Builder builder = new Builder(new 
ResolvingXMLReader());
                        builder.build(in);
                } catch (Exception e) {
                        e.printStackTrace();
                        throw e;
                }
        }
}