KEY-KEYREF validation

[Markus Heinisch <Ma...@trivadis.com>]

Hi,

I'm working with xerces 2.2.1. I try to validate an XML document with an
Key-Keyref XML Schema but my Java code (and xerces parser) does not find
the errors in my XML document. Element hr/depts/dept/DEPTNO contains the
key and hr/emps/emp/DEPTNO contains the keyref.

My question is: How do I have to configure xerces to validate the
document? 
I am not interested in the DOMTree and I would like to avoid to
write/use additional helper classes. I just want to validate the
document fast.

Please, have a look at my code.

Any hints are welcome.
Thanks alot.

Markus Heinisch
---------------------------
XML DOC:
========
<?xml version="1.0"?>
<hr xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xsi:noNamespaceSchemaLocation="hr.xsd">
 <depts>
  <dept>
   <DEPTNO>10</DEPTNO> <!-- key  -->
   <DNAME>ACCOUNTING</DNAME>
  </dept>
  <dept>
   <DEPTNO>10</DEPTNO> <!-- double key value-->
   <DNAME>RESEARCH</DNAME>
  </dept>
 </depts>
 <emps>
  <emp>
   <EMPNO>7499</EMPNO>
   <ENAME>ALLEN</ENAME>
   <DEPTNO>30</DEPTNO> <!-- does not ref. to a key value -->
  </emp>
 </emps>
</hr>

XML SCHEMA:
===========
<?xml version = '1.0'?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <xsd:element name="hr">
      <xsd:complexType>
         <xsd:sequence>
            <xsd:element name="depts">
               <xsd:complexType>
                  <xsd:sequence>
                     <xsd:element name="dept" minOccurs="0"
maxOccurs="unbounded">
                        <xsd:complexType>
                           <xsd:sequence>
                              <xsd:element name="DEPTNO"
type="xsd:integer" nillable="false" />
                              <xsd:element name="DNAME"
type="xsd:string" minOccurs="0"/>
                           </xsd:sequence>
                        </xsd:complexType>
                     </xsd:element>
                  </xsd:sequence>
               </xsd:complexType>
            </xsd:element>
            <xsd:element name="emps">
               <xsd:complexType>
                  <xsd:sequence>
                     <xsd:element name="emp" minOccurs="0"
maxOccurs="unbounded">
                        <xsd:complexType>
                           <xsd:sequence>
                              <xsd:element name="EMPNO"
type="xsd:integer" />
                              <xsd:element name="ENAME"
type="xsd:string" minOccurs="0"/>
                              <xsd:element name="DEPTNO"
type="xsd:integer" nillable="false"/>
                           </xsd:sequence>
                        </xsd:complexType>
                     </xsd:element>
                  </xsd:sequence>
               </xsd:complexType>
            </xsd:element>
         </xsd:sequence>
      </xsd:complexType>
      <xsd:key name="deptPK">
         <xsd:selector xpath="depts/dept" />
         <xsd:field xpath="DEPTNO" />
      </xsd:key>
      <xsd:keyref name="empDeptFK" refer="deptPK">
         <xsd:selector xpath="emps/emp" />
         <xsd:field xpath="DEPTNO" />
      </xsd:keyref>
   </xsd:element>
</xsd:schema>


MY CODE:
========
  public static void main(String[] argv) throws Exception {
    if (argv.length != 1) {
      // Must pass in the name of the XML file.
      System.err.println("Usage: java xmlp filename");
      System.exit(1);
    }

    // get the parser factory
    System.setProperty("javax.xml.parsers.DocumentBuilderFactory",
 
"org.apache.xerces.jaxp.DocumentBuilderFactoryImpl");
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance
();
    factory.setAttribute
("http://apache.org/xml/features/validation/schema", 
                          new Boolean(true));
    //factory.setAttribute
("http://apache.org/xml/features/validation/schema-full-checking", 
    //                      new Boolean(true));
    factory.setAttribute ("http://xml.org/sax/features/namespaces", 
                          new Boolean(true));

    // Get an instance of the parser
    DocumentBuilder parser = factory.newDocumentBuilder ();
    parser.setErrorHandler(new org.xml.sax.helpers.DefaultHandler(){
        public void error(SAXParseException exception)
{System.out.println (exception);}
        public void fatalError(SAXParseException
exception){System.out.println (exception);}
        public void warning(SAXParseException
exception){System.out.println (exception);}
      }
    );

/* Several other configuration tests
   ---------------------------------
    DOMParser parser = new DOMParser();
    try {
        parser.setFeature
("http://apache.org/xml/features/validation/schema", 
                           true);
        parser.setFeature
("http://apache.org/xml/features/validation/schema-full-checking", 
                           true);
    }
    catch (SAXException e) {
        System.err.println("could not set parser feature");
    }    

    System.setProperty("javax.xml.parsers.DocumentBuilderFactory",
                       "org.apache.xerces.jaxp.SAXParserFactoryImpl");
    SAXParserFactory factory = SAXParserFactory.newInstance ();
    SAXParser parser = factory.newSAXParser();
    XMLReader reader = parser.getXMLReader();
    try {
        reader.setFeature
("http://apache.org/xml/features/validation/schema", 
                           true);
        reader.setFeature
("http://apache.org/xml/features/validation/schema-full-checking", 
                           true);
    }
    catch (SAXException e) {
        System.err.println("could not set parser feature");
    }
*/
    // Generate a URL from the filename.
    URL url = Util.getURLFromFile (argv[0]);

    // Parse and obtain the document.
    System.out.println ("parsing " + url.toString ());
    Document doc = parser.parse(url.toString ());
/*    parser.parse(new InputSource(url.toString ()), 
                 new org.xml.sax.helpers.DefaultHandler());
*/    System.out.println ("done.");
  }
}

 

------------------------------------------
Markus Heinisch      

Dipl.-Inform. 
Consultant 

Trivadis GmbH 
Freischützstrasse 92 
81927 München 
Germany 

Tel.: +49-89-99275930
Fax : +49-89-99275959 
Mobile: +49-172-7032261 
mailto:markus.heinisch@trivadis.com 
http://www.trivadis.com
trivadis Techno Circle