Undefined data type: 'token'

I've got a committee designed xsd that I need to read and read xml data against it.

I'm getting this error 'Undefined data type: 'token'' on the second line of this VS2005 VB code:

Dim _ds As New DataSet
_ds.ReadXmlSchema("long path to.xsd")

The xsd I'm trying to read has 3 files, 2 imports. It looks like this:
transcript <-- academic record <-- core

The only place in the 3 files I find 'token' is in the core.xsd file. One of 2 occurrences looks like this:
<xs:simpleType name="StateProvinceCodeType">
<xs:annotation>
<xs:documentation>Code for US states, etc., and Canadian provinces:
AA Military-Americas
AB Alberta
...
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:token">
<xs:enumeration value="AA">
<xs:annotation>
<xs:documentation>MILITARY-AMERICAS</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="AB">
<xs:annotation>
<xs:documentation>ALBERTA</xs:documentation>
</xs:annotation>
</xs:enumeration>
...
</xs:restriction>
</xs:simpleType>

I think I know what the committee was trying to do with this schema segment. Maybe VS2K5 doesn't implement this 'token' construct.

Does anyone know of a workaround to this problem

Thanks.

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