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<p>A reasonably comprehensive set of data accessing and manipulation operations that should be supported by a generalized pictorial database management system (PDBMS) is proposed. A corresponding high-level query language, PICQUERY, is presented and illustrated through examples. PICQUERY has been designed with a flavor similar to QBE as the highly nonprocedural and conservational language for the pictorial database management system PICDMS. PICQUERY and a relational QBE-like language would form the language by which a user could access conventional relational databases and at the same time pictorial databases managed by PICDMS or other robust PDBMS. This languageinterface is part of an architecture aimed toward data heterogeneity transparency over pictorial and nonpictorial databases.</p>
PICQUERY; high level query language; pictorial database management; conservational language; PICDMS; relational QBE-like language; relational databases; language interface; data heterogeneity transparency; database management systems; query languages; user interfaces

T. Joseph and A. Cardenas, "PICQUERY: A High Level Query Language for Pictorial Database Management," in IEEE Transactions on Software Engineering, vol. 14, no. , pp. 630-638, 1988.
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