Can't validate W3C XML meta-schema

[Ian Pilcher]

Here's something rather interesting. I was working on a quick program
to validate XML documents against W3C schemas, and it occurred to me
that it might not be a bad idea to validate the schemas themselves. And
since I was going to validating schemas, and I had the meta-schema
handy...

Anyway, it doesn't appear to work. I'm attaching the code as
text/plain to avoid word wrap problems. Here is the output:

Meta-schema parsed
Meta-schema compiled
ERROR: 'UndeclaredPrefix: Cannot resolve 'xs:anyType' as a QName: the
prefix 'xs' is not declared.'

The stack trace confirms that the exception occurs at
schemaValidator.validate(metaSchemaSource);

A quick look at the metaschema shows that the 'xs' prefix certainly
appears to be declared.

BTW, the meta-schema and its associated DTDs can be found at
http://www.w3.org/2001/XMLSchema

Anyone see an obvious error in the code?

TIA

 

[Andrew Thompson]

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Date: Mon, 22 Aug 2005 23:29:49 -0500
From: Ian Pilcher <[email protected]>
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Subject: Can't validate W3C XML meta-schema
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--
Andrew Thompson
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Superstition ain't the way"
Stevie Wonder 'Superstitious'

 

[Ian Pilcher]

<I usually get details wrong about 'attachments'>
My news client indicated your post was 84 lines, though
only aout 20 showed, and an icon like an 'attachment'
appeared beside your post. I cannot access it.

Please post content for this group in the body.
</I usually get details wrong about 'attachments'>

I'm afraid that my client is going to munge this terribly, be here goes:

package skitch.util;

import javax.xml.validation.*;
import javax.xml.parsers.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.Source;
import org.w3c.dom.*;
import java.net.*;
import java.io.*;

import static javax.xml.XMLConstants.W3C_XML_SCHEMA_NS_URI;

/**
* A utility program to validate an XML file against a schema. (Since
* <tt>xmllint</tt> seems to be horribly broken.)
*/
public class CheckXML
{
public static void main(String[] args) throws Exception
{
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder parser = dbf.newDocumentBuilder();

URL url = CheckXML.class.getResource("../resources/XMLSchema.xsd");
File metaSchemaFile = new File(url.toURI());
Document metaSchemaDoc = parser.parse(metaSchemaFile);
Source metaSchemaSource = new DOMSource(metaSchemaDoc);
System.out.println("Meta-schema parsed");

SchemaFactory sf = SchemaFactory.newInstance(W3C_XML_SCHEMA_NS_URI);
Schema metaSchema = sf.newSchema(metaSchemaSource);
System.out.println("Meta-schema compiled");

Validator schemaValidator = metaSchema.newValidator();
schemaValidator.validate(metaSchemaSource);
System.out.println("Meta-schema validated");
}
}