OSQL [1, 2] is an functional query language and data model similar to Daplex, first implemented in the Iris DBMS . The data model of OSQL is object oriented with three kinds of system entities: objects, types, and functions. A database consists of a set of objects, the objects are classified into types, and functions define the semantics of types. The data model is similar to an ER model with the difference that both entity relationships and attributes are represented as functions and that (multiple) inheritance among entity types is supported. OSQL provide object identifiers (OIDs) as first class objects, and, unlike Daplex, queries can return OIDs in results. Queries are expressed using a SELECT syntax similar to SQL. Derived functions are also defined using select statements similar to functions in SQL-2003.
With the OSQL data model a database consists of a set of objects. The objects are classified into subsets by types and each type has an extent...
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