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The Computer Journal 1981 24(2):125-129; doi:10.1093/comjnl/24.2.125
© 1981 by British Computer Society
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SYSTEMATICS: its syntax and semantics as a query language (2)

A. Sernadas *

Faculdade Ciencias, Matematica Aplicada, 58 Rua da Escola Politecnica, Lisboa, Portugal

SYSTEMATICS (a very high level specification language) is shown to be incomplete as a data base query language. Some extensions are proposed in order to ensure the desired degree of relational completeness. Moreover, the set-oriented SYSTEMATICS is compared with a predicate-oriented query language in order to assess the practical interest of the main construct of SYSTEMATICS (the identification construct). A proof of the completeness of the extended version of SYSTEMATICS is outlined. A concrete syntax for this version is proposed. The semantics of this extended version is developed within a set theoretic framework.

Received June 1979.

* Faculdade Ciéncias, Matemática Aplicada, 58 Rua da Escola Politécnica, 1294 Lisboa Codex, Portugal


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