OAGIS Version 8.0 SP 3 Validation w/ MSXML 4.0 VS.NET 2K3

[AdrianEvans]

I am trying to build a .NET assembly which will contain the OAGIS schemas
using OAGIS version 8.0 SP 3. When I try to validate the schemas,
specifically the Order.xsd schema, I get the following error:

Invalid particle derivation by restriction: Order.xsd line 16

I have searched google, the yahoo group and several other sources and found
that other users are experiencing the same thing. Do you have any information
about this error, and do you know if this is a Microsoft specific problem? It
appears that the error is occurring because the Order restriction has the
following format:

<xs:complexType name="Order">

<xs:complexContent>

<xs:restriction base="Document">

<xs:sequence>

<xs:element
ref="Header" minOccurs="0"/> // I believe the error has something to do with
these two lines being invalid

<xs:element
ref="Line" minOccurs="0" maxOccurs="unbounded"/> // second line

</xs:sequence>

</xs:restriction>

</xs:complexContent>

</xs:complexType>

Any help would be greatly appreciated!!!!

Thanks in advance