In SQL Server, you cannot specify XSD file to create a TYPED XML document, instead you need to create an XML SCHEMA Collection and then associate an XML document with a schema collection.

The following articles might help you to get started with XML Schema Collections:

http://beyondrelational.com/blogs/jacob/archive/2009/03/15/sql-server-xsd-typed-xml-and-schema-collections.aspx

http://beyondrelational.com/blogs/jacob/archive/2009/03/10/sql-server-xsd-validating-values-with-schema.aspx