Weakly Constraining Multimedia Types Based on a Type Embedding Ordering

Authors:
Christian Altenschmidt;Joachim Biskup;Jürgen Freitag;Barbara Sprick
Affiliations:
-;-;-;-
Venue:
MIS '98 Proceedings of the 4th International Workshop on Advances in Multimedia Information Systems
Year:
1998

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Abstract

We present a concept of weakly constraining types which balances heterogeneity and fixity of data structures. This concept is designed for a multimedia mediator that uses fixed type declarations on schema level but allows variations of actual structures on instance level. The concept is based on a notion of embedding a fixed type declaration into a variation structure such that essential aspects of the fixed declaration are preserved. Finally we show how multimedia types gain from our type system.