XSD Schema export datatype issue

[dballard]

When I export a package containing tables using SQL Server 2005 datatypes, I get a warning:

Warning no XSD type found for: "bigint".  Default is: xs:string

This is frustrating in that I can't find a reference to where I can add the database datatypes so my XSD export will stop transalting to string!

I have added the XSDDataTypes XMI as a package to my model and this hasn't cleared it up.

I really want to use the schema to ultimately produce an EDMX file for use in VS2010 entity designer.  Or writer my own template.

Thanks for your help.
Dave