Schema Validation problem

[dswanson1]

I'm trying to validate a document against a Schema and I'm getting the
following error...

Runing VAJ 3.5, NT4.0 sp6, Xerces 1.4, Xalan 2.0.1

Debugger Stack Trace Report:

Thread[main,5,main] (Alive)
Problem in org.apache.xerces.utils.regex.Op
org.apache.xerces.utils.regex.RegularExpression.compile(org.apache.xerces.utils.regex.Token,

org.apache.xerces.utils.regex.Op, boolean): Type mismatch: cannot convert
from org.apache.xerces.utils.regex.Op$ModifierOp to
org.apache.xerces.utils.regex.Op.

Here is my code....

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setValidating(true);
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();
DefaultHandler def = new MyErrorHandler();
builder.setErrorHandler(def);
Document mydoc = builder.newDocument();
Document d = builder.parse("file:///D:/somedirectory/xmldoc/simple.xml");

Here is the XML instance

<request xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:noNamespaceSchemaLocation="simple.xsd"
server="someserver" database="mydatabase">
     <mmm_facility_code>ht</mmm_facility_code>
     <qc_status_code>Qtx</qc_status_code>
</request>

Here is the Schema...

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema";>
     <element name="request">
          <complexType>
               <sequence>
                    <element ref="mmm_facility_code"/>
                    <element ref="qc_status_code"/>
               </sequence>
               <attribute name="server" type="string" use="required"/>
               <attribute name="database" type="string" use="required"/>
          </complexType>
     </element>
     <element name="mmm_facility_code" type="string"/>
     <element name="qc_status_code" type="string"/>
</schema>

Do I need to upgrade my Xerces?  Is my Schema correct?  Is there anyway for
documents to come in (like via a SOAP service) with the SPECIFIC location
of the schema document and allow me to programaticly look at the Schema
name and load it then validate the document against that schema? (kind of
the the Microsoft SchemaCache concept).

thanks
Doug