Proper XML schema for XML files only using a default namespace

Hi

I'm struggling in defining a proper XML schema for following XML file:

<?xml version="1.0" encoding="UTF-8"?>
<VisioDocument xmlns="urn:schemas-microsoft-com:office:visio">
</VisioDocument>

E.g. XMLSpy suggests the XML schema:

<?xml version="1.0" encoding="UTF-8"?>
<!--W3C Schema generated by XMLSPY v5 U (http://www.xmlspy.com)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
 <xs:element name="VisioDocument">
  <xs:complexType>
   <xs:simpleContent>
    <xs:extension base="xs:string"/>
   </xs:simpleContent>
  </xs:complexType>
 </xs:element>
</xs:schema>

Validation of the XML file returns the error:
"Root element of document 'vd.xml' is not defined in schema document or part of wrong namespace"

I guess the second assumption is correct, but is there somebody to make a better job than XMLSpy?

Thanx
Manfred

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