A graphic query language for cartographic and land information systems

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Abstract
In the computing industry, many regional and international standards organizations such as the American National Standards Institute (ANSI), the Institute for Electrical and Electronics Engineering (I.E.E.E.) and the International Standards Organization (ISO) are actively engaged in the formulation of standards in an attempt to facilitate the development of computer software. It is therefore appropriate to take advantage of standards whenever possible to allow portability of the software. For users of land and geographical information, it is envisaged that there will be more land data banks being made available for public enquiries. There will certainly be a need to have portable software that can be easily used by users with low-end computing resources to retrieve data selectively, both in report or graphical forms, from land data banks. A high-level query language to facilitate such selection is extremely useful. A graphic query language (GQL) which enables users to retrieve information selectively is presented in this paper. GQL is structured in SQL (structured query language) fashion, allowing retrieval of textual and graphic information. It is designed to conform with ISO standard 7942 (graphical kernel system) and ISO standard 9075 (database language SQL).

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