Validation feature problems

When I try to parse this xml file:

<?xml version="1.0" encoding="UTF-8"?>
<myns:BOGUS xmlns:myns="http://www.bogus.com"; 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
    xsi:schemaLocation="http://www.bogus.com file://C:/xml/bogus.xsd">
    <myns:FOO>
        Yada yada yada 
    </myns:FOO>
</myns:BOGUS>

with this schema:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.bogus.com"; 
    xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
    xmlns:myns="http://www.bogus.com"; 
    elementFormDefault="qualified" 
    attributeFormDefault="unqualified">
    <xs:element name="BOGUS">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="FOO" maxOccurs="unbounded">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:maxLength value="80"/>
                        </xs:restriction>
                    </xs:simpleType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

in Xerces 2.6.0 using these features:

        org.apache.xerces.parsers.SAXParser saxParser;
        ...
        saxParser.setFeature("http://xml.org/sax/features/validation";, true);
      saxParser.setFeature("http://xml.org/sax/features/validation/schema";, 
true);
        ...

I get this error:

  Exception class: org.xml.sax.SAXParseException
  Message:         Document is invalid: no grammar found.
  Line:            2
  Column:          12

Any idea why? It works with other validating parsers, and has no problems if 
the validation feature is turned off.

Thanks,
Thomas Cox