Validation with jaxp 1.3 and xml-schema

Question

I'm totally green when it comes to xml&jaxp. Using jse 1.5 (jaxp 1.3), I'm trying
to have my app parse and validate an xml doc with xml schema. I want the validation to
happen using the schema specified in the xml doc. Also, I'd prefer if my application didn't have to set
the schema to use. As far as I can make out though, it appears that I need to parse the schemaLocation when
I want to validate using xml schema. Anyone know a way to avoid that step?
If not, then any idea why I'm getting the following err?
Error...
junit.framework.AssertionFailedError: null/null:4,9: Document is invalid: no grammar found.null/null:4,9: Document root element "catalog", must match DOCTYPE root "null".
     at junit.framework.Assert.fail(Assert.java:47)
     at com.rwd.toolbox.junit.AbstractRwdTestCase.printAndFail(AbstractRwdTestCase.java:229)
     at com.rwd.util.xml.XmlUtilsTests.testXmlValidationUsingSchemaDefinedInXmlDoc(XmlUtilsTests.java:57)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     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:478)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Code... obviously taken from junit test case...
     DocumentBuilderFactory documentFactory = DocumentBuilderFactory.newInstance();
     documentFactory.setNamespaceAware(true);
     documentFactory.setValidating(true);
     DocumentBuilder builder = documentFactory.newDocumentBuilder();
     com.rwd.util.xml.Validator v = new com.rwd.util.xml.Validator(_validationStyle);
     builder.setErrorHandler(v);
     Document document = builder.parse(_document);
     where com.rwd.util.xml.Validator extends DefaultHandler. Note that if I add following
     code, then validation works as i expect it... but that's not really an option I care for (at least in this case).
     I would anticipate being able to have the parser see the XSD reference in the XML and
     apply it. Anyway, here's code to programmatically specify an XSD to use for validation....                    
     documentFactory.setAttribute(
     "http://java.sun.com/xml/jaxp/properties/schemaLanguage",
     "http://www.w3.org/2001/XMLSchema");
     documentFactory.setAttribute(
     "http://java.sun.com/xml/jaxp/properties/schemaSource",
     "file:///C:/workspace31m4/LMSTester/testData/util/xml/o.xsd");
Finally, the XML file... (example from onJava site)... Note that I've tried changing the URI to file:///c:/..., same result:
<?xml version="1.0" encoding="UTF-8"?>
<!--A OnJava Journal Catalog-->
<catalog
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="file://C:/workspace31m4/LMSTester/testData/util/xml/o.xsd"
title="OnJava.com" publisher="O'Reilly">
<journal date="April 2004">
<article>
<title>Declarative Programming in Java</title>
<author>Narayanan Jayaratchagan</author>
</article>
</journal>
<journal date="January 2004">
<article>
<title>Data Binding with XMLBeans</title>
<author>Daniel Steinberg</author>
</article>
</journal>
</catalog>
and its XSD file (also from onJava)...
<?xml version="1.0" encoding="utf-8"?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="catalog">
<xs:complexType>
<xs:sequence>
<xs:element ref="journal" minOccurs="0"
maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="title" type="xs:string"/>
<xs:attribute name="publisher" type="xs:string"/>
</xs:complexType>
</xs:element>
<xs:element name="journal">
<xs:complexType>
<xs:sequence>
<xs:element ref="article" minOccurs="0"
maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="date" type="xs:string"/>
</xs:complexType>
</xs:element>
<xs:element name="article">
<xs:complexType>
<xs:sequence>
<xs:element name="title" type="xs:string"/>
<xs:element ref="author" minOccurs="0"
maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="author" type="xs:string"/>
</xs:schema>
Thanks,
-Paul

Answer 1

There are other applications using Xerces1.0 so the requirement is that I cannot replace the Xerces jar. Any suggestions.