Parser doesn't recognize schema namespace

Question

I've got the following bit of code:
                org.apache.xerces.parsers.DOMParser parser = new org.apache.xerces.parsers.DOMParser();
                parser.setFeature("http://xml.org/sax/features/namespaces", true);
                parser.setFeature("http://apache.org/xml/features/validation/schema", true);
                parser.setFeature( "http://xml.org/sax/features/validation", true);
                ErrorHandler handler = new MyErrorHandler();
                parser.setErrorHandler(handler);
                parser.parse(name);The schema file I want it to parse (and validate) is below. Its a simple example taken from the w3schools web site. I have almost no doubt the file is a valid schema file.
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.w3schools.com"
xmlns="http://www.w3schools.com"
elementFormDefault="qualified">
<xs:element name="note">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="to" type="xs:string"/>
        <xs:element name="from" type="xs:string"/>
        <xs:element name="heading" type="xs:string"/>
        <xs:element name="body" type="xs:string"/>
      </xs:sequence>
    </xs:complexType>
</xs:element>
</xs:schema>Below are the first few errors generated. The real head scratcher is having no clue about the URI I gave it, and then suggesting the SAME one as what I really should use. Getting these parsers setup to do validation has been a major pain. Anyone know what I left out?
Error at 5 : org.xml.sax.SAXParseException: General Schema Error: Grammar with uri: http://www.w3.org/2001/XMLSchema , can not be found; schema namespace may be wrong: Xerces supports schemas from the "http://www.w3.org/2001/XMLSchema" namespace or the instance document's namespace may not match the targetNamespace of the schema.
Error at 5 : org.xml.sax.SAXParseException: Element type "xs:schema" must be declared.
Error at 7 : org.xml.sax.SAXParseException: Element type "xs:element" must be declared.

Answer 1

Thanks for the replies, but I don't think we are quite connecting. I do eventually want to be able to validate an XML file against a schema (which I can't do either), but first I want to be able to validate the schema file itself; i.e. to confirm that the schema I designed is a valid schema file. As I understand it, it should be possible to tell the parser that the schema to validate against is the "schema for writing schemas", http://www.w3.org/Schema/schema.xsd (or whatever it is). That's where I'm getting stuck, that the parser doesn't recognize the elements for actually defining a schema.