title: Sharing entity types across multiple edmx files
body: <p>We are using Entity Framework 4 with the POCO Entity Generator. Until now we've just had one .edmx file but we're running into performance problems due to the current size of it (well over 100 entities). </p>
  
  <p>I understand we should be looking to break this into a series of .edmx files which is fine with one exception. We would want to somehow share certain entity types across two or more of these contexts. For example a User class is associated with numerous otherwise unrelated entities throughout our model.</p>
  
  <p>So is it possible to have, say, a security model with its own .edmx and namespace for generated POCOs, but use it in another .emdx? If not I'm concerned we'll have multiple classes modelling the same database table which will need to be updated in sync with the database. I'd say that would be unworkable. (We're using database-first).</p>
  
  <p>Obviously if I'm barking up the wrong tree do let me know! </p>