Problem with xmlns when validating a trivial document

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What steps will reproduce the problem?

There seems to be some issue with validation when namespaces are used:

--8<--

<?xml version="1.0" encoding="UTF-8"?>

<rng:grammar
  xmlns:rng="http://relaxng.org/ns/structure/1.0"
  xmlns:p="some.namespace"
  datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

  <rng:start>
    <rng:ref name="p.p"/>
  </rng:start>

  <rng:define name="p.p">
    <rng:element name="p:p">
      <rng:text/>
    </rng:element>
  </rng:define>

</rng:grammar>

--8<--

<?xml version="1.0" encoding="UTF-8"?>
<p:p xmlns:p="some.namespace">Hello</p:p>

--8<---

import java.io.File;
import java.io.IOException;

import javax.annotation.Nonnull;
import javax.xml.XMLConstants;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public final class test {

  public static void main(String[] args) {
    System.setProperty("javax.xml.validation.SchemaFactory:"+XMLConstants.RELAXNG_NS_URI,
    "com.thaiopensource.relaxng.jaxp.XMLSyntaxSchemaFactory");

    // Initialise SAX parser and schema factory.
    final @Nonnull SAXParserFactory parser_factory 
      = SAXParserFactory.newInstance();
    final @Nonnull SchemaFactory schema_factory =
      SchemaFactory.newInstance("http://relaxng.org/ns/structure/1.0");

    final File schema_location = new File("test.rng");
    try {
      final @Nonnull Schema schema = schema_factory.newSchema(schema_location);
      parser_factory.setNamespaceAware(true);
      parser_factory.setSchema(schema);
      final @Nonnull SAXParser parser = parser_factory.newSAXParser();
      parser.parse("test.xml", (DefaultHandler) null);
    } catch (ParserConfigurationException e) {
      System.out.println(e.getMessage());
    } catch (SAXException e) {
      System.out.println(e.getMessage());
    } catch (IOException e) {
      System.out.println(e.getMessage());
    } 
  }
}

--8<---

What is the expected output? What do you see instead?

The document should validate (it does using other validators such as
xmllint, and the jing command line tool):

$ xmllint --noout --relaxng test.rng test.xml
test.xml validates
$ java -jar jing.jar test.rng test.xml
$

Instead, the java program above will raise an exception:

found attribute "xmlns:p", but no attributes allowed here

What version of the product are you using? On what operating system?

jing-20091111, openjdk 6, freebsd 8.1 amd64.

Please provide any additional information below.

Original issue reported on code.google.com by xorquew...@googlemail.com on 2 Feb 2011 at 11:02