// GET api/diagrams/DEFG12345/ACL/UserABC123
public Diagram.ACL Get(Guid id, string userName)
{
Diagram.ACL acl = new Diagram.ACL();
return acl;
}
// GET api/diagrams/DEFG12345/layouts/
public Diagram.ACL Get(Guid diagramId)
{
Diagram.ACL acl = new Diagram.ACL();
return acl;
}