1. Apparatus for integrating non-object structured data, stored in an external data store having an external data store interface, with at least one object application which processes object data structures through an ODBMS application interface, comprising: a storage manager mechanism responsive to said ODBMS application interface and said external data store interface, including, a first interface, between said ODBMS application interface and said storage manager mechanism, said first interface comprising a plurality of first interface constructs including objects, references, indices, extensions and transactions, and facilitating handling of said plurality of first interface constructs for communicating with said ODBMS application interface to transfer object data structures between said storage manager mechanism and said at least one object application; an integral mapping mechanism responsive to said first interface and receiving at least some of said plurality of first interface constructs, said mapping mechanism mapping said at least some of said plurality of first interface constructs to a plurality of second interface constructs to effect transformation of object data structures to non-object structured data for storage in said external data store and to effect transformation of non-object structured data to object data structures for use by said at least one object application; and a second interface between said mapping mechanism and said external data store, said second interface comprising said plurality of second interface constructs and facilitating handling of said plurality of second interface constructs for communicating with said external data store interface to transfer non-object structured data between said storage manager mechanism and said external data store.