Can't validate xml file

Hi
My problem is that I'm not able to validate my xml file using example code taken from java.sun.com page:
http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/validation/package-summary.html
The source code is:
// parse an XML document into a DOM tree
    DocumentBuilder parser = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    Document document = parser.parse(new File("instance.xml"));
    // create a SchemaFactory capable of understanding WXS schemas
    SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    // load a WXS schema, represented by a Schema instance
    Source schemaFile = new StreamSource(new File("mySchema.xsd"));
    Schema schema = factory.newSchema(schemaFile);
    // create a Validator instance, which can be used to validate an instance document
    Validator validator = schema.newValidator();
    // validate the DOM tree
    try {
        validator.validate(new DOMSource(document));
    } catch (SAXException e) {
        // instance document is invalid!
    }My XSD file:
<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/schema" xmlns:tns="http://www.example.org/schema">
     <element name="parent">
          <complexType>
               <sequence maxOccurs="unbounded" minOccurs="0">
                    <element name="child" type="string"></element>
               </sequence>
          </complexType>
     </element>
</schema>..and my XML file:
<?xml version="1.0" encoding="UTF-8"?>
<tns:parent xmlns:tns="http://www.example.org/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.org/schema schema.xsd ">
</tns:parent>..and the error message:
org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'tns:parent'.
     at com.sun.org.apache.xerces.internal.jaxp.validation.Util.toSAXParseException(Util.java:109)
     at com.sun.org.apache.xerces.internal.jaxp.validation.ErrorHandlerAdaptor.error(ErrorHandlerAdaptor.java:104)
     at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:382)
     at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:316)
     at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1944)
     at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:705)
     at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.startElement(ValidatorHandlerImpl.java:335)
     at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1020)
     at org.apache.xml.utils.TreeWalker.startNode(TreeWalker.java:347)
     at org.apache.xml.utils.TreeWalker.traverse(TreeWalker.java:159)
     at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:337)
     at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.process(ValidatorImpl.java:220)
     at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:141)
     at javax.xml.validation.Validator.validate(Validator.java:82)
     at main.XMLValidation.main(XMLValidation.java:42)I've lost any ideas. What's wrong?????????? HELP
ania

I am also using rsaft_pt_xml to generate audit file for Protugal project. The xml file losing </auditfile> and </masterfile> tag. In that case, the xml file can not be display correctly. We also have patched the sap notes to "1543036 - SAFT-PT Corrections RSAFT_PT_XML for 2010 (16)", but it does not work. Do you know how to solve this issue?

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