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نویسندگان
چکیده
There are many applications which arise in telecommunications information processing in which it is useful, and often necessary, to create and access multiple hypothetical states. These might correspond to future states reeecting pending updates (such as customer service orders), or hypothetical alternative states that would arise in the exploration of diierent solutions to a given problem. In this paper we show how the Heraclitus family of database programming languages can be applied to satisfy such requirements. The fundamental capability provided by Heraclitus is to capture database updates as deltas; these are syntactic objects which can be eeciently manipulated by application programs and database users. Deltas can be used to represent pending or hypothetical updates to the database. We also consider the issue of incorporating Hera-clitus functionalities into legacy database systems currently in use by telecommunications companies.
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