Schema error in BizTalk project

I have a schema that was generated by my code.  This schema seems to be 
valid in every sense.  I am able to open the schema in explorer or in
Visual 
Studio in a C# project.  However, when I add this schema to a BizTalk 
project, I get the following error:

Error 1 File LWAPIRequest.xsd contains invalid values for namespace or
type 
name properties. C:\Do***ents and Settings\wsadiq\Local 
Settings\Temp\BrierleyDA\MemberProcessing\Schemas\LWAPIRequest.xsd

Can anyone point out if there are any specific requirements for a BizTalk 
project to be happy with an external schema?

Thanks.

Waqar

--------------------------- Schema ---------------------------------------
<?xml version="1.0" encoding="utf-16" ?>
- <xs:schema xmlns:b="http://schemas.microsoft.com/BizTalk/2003"

targetNamespace="http://BrierleyDA.MemberProcessing.Schemas.LWAPIRequest"

xmlns:xs="http://www.w3.org/2001/XMLSchema">
- <xs:element name="LWAPIRequest">
- <xs:complexType>
- <xs:sequence>
  <xs:element name="OperationName" type="xs:string" />
  <xs:element name="OperationParameter" type="xs:string" />
  </xs:sequence>
  </xs:complexType>
  </xs:element>
  </xs:schema>