advice on xmlns requested

Is the following  schema header valid?  If not, what would make it valid?

<xsd:schema targetNamespace="WebServiceModel"
elementFormDefault="unqualified" 
attributeFormDefault="qualified"
xmlns:AILoan="AILoan" 
xmlns:WebServiceClass="WebServiceClass" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
xmlns:WebServiceModel="WebServiceModel">

Thanks

Ken