Intl. Conference on Very Large Data Bases (VLDB'94) ,
Santiago de Chile, 1994.

Access to Objects by Path Expressions and Rules

J. Frohn, G. Lausen, and H. Uphoff


Object oriented databases provide rich structuring capabilities to organize the objects being relevant for a given application. Due to the possible complexity of object structures, path expressions have become accepted as a concise syntactical means to reference objects. Even though known approaches to path expressions provide quite elegant access to objects, there seems to be still a need for more generality. To this end, the rule-language PathLog is introduced. A first contribution of PathLog is to add a second dimension to path expressions in order to increase conciseness. In addition, a path expression can also be used to reference virtual objects. Both enhancements give rise to interesting semantic implications.

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