Check this:

http://msdn2.microsoft.com/en-us/library/bc57azyw.aspx

[quoted text, click to view]

Hi Brad,
Thanks for KJ's quickly reply.

I'm afraid there are two issue in your XSD file.

1) Actually, XSD.exe doesn't support xs:union.

http://msdn2.microsoft.com/en-us/library/bc57azyw.aspx
[Union Element Binding Support ]
When Xsd.exe encounters a simple type defined by union, it will ignore the
<simpleType> definition and uses the built-in string data type in its place.

To resolve this issue, you may create a union SimpeType manually in your
xsd file.
<xs:simpleType ...>
<xs:restriction ...>
<xs:enumeration value="1" />
...
<xs:enumeration value="0" />
<xs:enumeration value="-1" />
</xs:restriction>
</xs:simpleType>


2) Only when the <enumeration> facet is applied to string-based types like
xsd:string does the Xsd.exe translate it into a .NET Framework enum
definition
http;//msdn2.microsoft.com/en-us/library/z2w0sxhf.aspx
[Enumeration Element Binding Support]

This means the "SimpleInts" in your xsd file will be translated as "string"
type rather than "int" type.
<xs:simpleType name="SimpleInts">
<xs:restriction base="xs:int">
<xs:enumeration value="1" />
...
</xs:restriction>

Otherwise, you may set base to "xs:int" and delete enumeration from your
xsd file.
<xs:simpleType name="SimpleInts">
<xs:restriction base="xs:int">
</xs:restriction>

Hope this helps. Please let me know if you have anything unclear. I'm glad
to assit you.
Sincerely,
Wen Yuan
Microsoft Online Community Support
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Hello Brad,

This is Wen Yuan again. I just want to check if there is anything we can
help with.
If you still have anything unclear or any more concern, please let me know
and I'm glad to assist you.

Have a nice weekend. Thanks.
Sincerely,
Wen Yuan
Microsoft Online Community Support
==================================================
This posting is provided "AS IS" with no warranties, and confers no rights.