xml validate error

In my C# app, I create a class which holds an arraylist.
Then i serialize it to disk as wdwebsvc.xml
Then i run XSD.EXE and generate the 2 below .xsd files.
So when i then attempt to validate the xml with the xsd file, i get the below error.
Whats wrong? I am so confused?
Peter


got exception The global element 'http://tempuri.org/WDWEBSVC.xsd:OurRootClass' has already

been declared. An error occurred at

file:///C:/JUNK/DEV/WATCHDOG/WDWEBSVC/WDCLIENT/bin/Debug/WDWEBSVC.XSD, (4, 4).

-------------------------
wdwebsvc.xml:

<?xml version="1.0" encoding="utf-8"?>
<OurRootClass xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns="http://tempuri.org/WDWEBSVC.xsd">
<Items>
<Item>
<strItemName xmlns="http://www.aspnetsbs.com/webservices/">Ping Nifty

Tools</strItemName>
<strItemAddress

xmlns="http://www.aspnetsbs.com/webservices/">www.niftytools.com</strItemAddress>
</Item>
<Item>
<strItemName xmlns="http://www.aspnetsbs.com/webservices/">Html download Nifty

Tools</strItemName>
<strItemAddress

xmlns="http://www.aspnetsbs.com/webservices/">http://www.niftytools.com</strItemAddress>
</Item>
</Items>
</OurRootClass>

-------------------------
WDWEBSVC.xsd:

<?xml version="1.0" encoding="utf-8"?>
<OurRootClass xmlns:xsd="http://www.w3.org/2001/XMLSchema"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns="http://tempuri.org/WDWEBSVC.xsd">
<Items>
<Item>
<strItemName xmlns="http://www.aspnetsbs.com/webservices/">Ping Nifty

Tools</strItemName>
<strItemAddress

xmlns="http://www.aspnetsbs.com/webservices/">www.niftytools.com</strItemAddress>
</Item>
<Item>
<strItemName xmlns="http://www.aspnetsbs.com/webservices/">Html download Nifty

Tools</strItemName>
<strItemAddress

xmlns="http://www.aspnetsbs.com/webservices/">http://www.niftytools.com</strItemAddress>
</Item>
</Items>
</OurRootClass>

--------------------------
wdwebsvc_app1.xsd:


<?xml version="1.0" standalone="yes"?>
<xs:schema id="OurRootClass" targetNamespace="http://www.aspnetsbs.com/webservices/"

xmlns:mstns="http://tempuri.org/WDWEBSVC.xsd" xmlns="http://www.aspnetsbs.com/webservices/"

xmlns:xs="http://www.w3.org/2001/XMLSchema"

xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" attributeFormDefault="qualified"

elementFormDefault="qualified" xmlns:app1="http://www.aspnetsbs.com/webservices/">
<xs:import namespace="http://tempuri.org/WDWEBSVC.xsd" schemaLocation="wdwebsvc.xsd" />
<xs:element name="strItemName" type="xs:string" />
<xs:element name="strItemAddress" type="xs:string" />
</xs:schema>