Vance E. Waddle

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Office-by-Example (OBE) is an integrated office information system that has been under development at IBM Research. OBE, an extension of Query-by-Example, supports various office features such as database tables, word processing, electronic mail, graphics, images, and so forth. These seemingly heterogeneous features are integrated through a language feature(More)
Conventional database design techniques rely heavily on the designer's skill and experience, which are neither efficient nor effective for large, realistic design problems. A computer design aid can help by storing many design parameters and performing simple preprocessing before design decisions are made. In this paper, we report on the development of such(More)
In order to have an effective logical database design tool, a designer should have facilities for specifying his data and application requirements at a high level. These specifications should be invariant with respect to a given realization, and should not require irrelevant details. Also, one should be able to compare alternative designs at a high level in(More)
Abstract syntax trees were devised as a compact alternative to parse trees, because parse trees are known to require excessive amounts of storage to represent parsed programs. However, the savings that abstract syntax trees actually achieve have never been precisely described because the necessary analysis has been missing. Without it, one can only measure(More)
This, paper presents a semantic model and proccssing lanousge upon which a logical detakase design tool cap be ossed. The sernarrtic motiel is invariant with respect tr, the placement of data items into records or rclotions. The. processing language is based on the semantic model, so processing speciFications are also invariant to these decisions. This(More)
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