no relations when importing xsd schema file

hello,

I have a schema of a database with 2 tables: a master and a detail table.
The relation between both is defined.

I want to access to build those table plus their relationsship.

I set up an empty database in ms access 2003 or 2007 and then use the
option: external tools.

This options allows opening the schema file.

The tables are then created correctly but the relation between the two
tables is missing. WHY??

The schema is developed by use of a dataset under Visual Studio and works
correctly in any vs developed application.

I have not found an example yet on the net of creating xsd based databases
at runtime. Can anyone point me to some docs.

Thanks