Transformation of relational schemas to object-oriented schemas

We present an algorithm that transforms schemas of relational databases to schemas of object-oriented databases (OODB). This algorithm has the following special features: (1) it transforms schemas between two commercial database systems, i.e., from Sybase relational schemas to O/sub 2/ OODB schemas; (2) it initiates limited interactive sessions between the schema transformer and its user when additional input to the schema transformer is necessary although most of the transformation is automated; and (3) the transformed schemas are typical OODB schemas that may contain class hierarchies, composition hierarchies, set attributes and subtuple constructs.