Checking the validity of URI for namespaces (targetNamespace)

[Brian Nielsen]

I've been stumbling around for a couple of weeks trying to get an idea of 
what's up and down when it comes to valid URI's for XML instances and XML 
Schemas. I earlier made a posting to the xml-dev list at Oasis, asking for the 
needed validity of namespace URIs and got sort of two answers. I now tried to 
use Xerces to se how it handles invalid URI's, but I havn't had much luck 
figuring out how to handle it.

My posting a oasis: http://lists.xml.org/archives/xml-dev/200408/msg00030.html
Other relevant unanswered posting 
http://lists.xml.org/archives/xml-dev/200101/msg01027.html


My example XSD is(MiddleName.xsd):

<?xml version="1.0" encoding="UTF-8" ?> 
        <schema         targetNamespace="HR-XML-AMS-DK" 
                        xmlns="http://www.w3.org/2001/XMLSchema"; 
                        xmlns:hrxml="HR-XML-AMS-DK" 
                        elementFormDefault="qualified" 
                        attributeFormDefault="unqualified">
        <element name="MiddleName" type="string" /> 
  </schema>


And instance (MiddleName.xml):
<?xml version="1.0" encoding="UTF-8" ?> 
<MiddleName xmlns="HR-XML-AMS-DK" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
                xsi:schemaLocation="HR-XML-AMS-DK 
MiddleName.xsd">String</MiddleName> 




I expect the feature http://apache.org/xml/features/standard-uri-conformant to 
be just what I was looking for, so I've made this small program to 
parse/validate an instance document at "xml/demo2.xml", and I would expect it 
to give me and error on the targetNamespace of the schema or the namespace 
declaration in the instance:



import java.io.IOException;


import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;


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

import java.net.URI;

public class SimpleSaxParser {

    public static void main(String argv[]) {

        SAXParserFactory saxdbf = SAXParserFactory.newInstance();
        saxdbf.setNamespaceAware(true);
        saxdbf.setValidating(true);

        try {
            saxdbf.setFeature("http://xml.org/sax/features/namespaces";, true);
            saxdbf.setFeature("http://xml.org/sax/features/validation";, true);
            
saxdbf.setFeature("http://apache.org/xml/features/validation/dynamic";, true);
            
saxdbf.setFeature("http://apache.org/xml/features/validation/schema";, true);
                
saxdbf.setFeature("http://apache.org/xml/features/validation/schema-full-checking";,
 true);
            
saxdbf.setFeature("http://apache.org/xml/features/standard-uri-conformant";, 
true);
            saxdbf.setFeature("http://xml.org/sax/features/namespace-prefixes";, 
true);
        } catch (ParserConfigurationException pce) {
            pce.printStackTrace();
        } catch (SAXNotRecognizedException snre) {
            snre.printStackTrace();
        } catch (SAXNotSupportedException snse) {
            snse.printStackTrace();
        }

        try {
            SAXParser saxParser = saxdbf.newSAXParser();
            saxParser.parse(new java.io.File("xml/MiddleName.xml"), new 
DefaultHandler());
        } catch (SAXException se) {
            se.printStackTrace();
        } catch (ParserConfigurationException pce) {
            pce.printStackTrace();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}


My questions are:
1. The targetNamespace "HR-XML-AMS-DK" is not a valid URI - right?
2. Why does'nt my program report that
3. Any idea how other parser "care" for valid URI's?


Best regards
Brian Nielsen





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