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Like any DBMS, a MM-DBMS is a general-purpose software system that supports various applications; but, the support is targeted to applications in the specific domain of digital libraries. Four new requirements have been identified for this domain: (1) multimedia objects can be active objects, (2) querying is an interaction process, (3) query processing uses multiple representations, and (4) query formulation provides content independence. The Mirror Architecture and its implementation in the Mirror DBMS therefore provide basic functionality for the management of both the content structure and the logical structure of multimedia objects.
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