To use information from different sources together is a desirable property for the users．especially in these internet days．A two-level multicontext architecture DBCL iS defined in this paper which can be used to integrate heterogeneous databases．Each context in its first level iS a classical many-sorted theory，which corresponds to a database．The context in the second level is a generalized many-sorted theory，where metatheories about the various relations among databases can be stated．A kind of semantics，with respect to which DBCL is sound as well as complete，is also provided in this paper．