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<p>A model and a language for specifying spatial integrity constraints in pictorial databases are presented. Spatial integrity constraints are assertions about the correct behavior of database systems that specify acceptable database states and state transitions. They also serve as restrictions on positions occupied by objects in a picture. The language presented primarily uses pictures to specify constraints. The constraint pictures depict unacceptable database states. A data model provides the basic semantics for picture interpretation.</p>
Allen Klinger, Arturo Pizano, Alfonso Cardenas, "Specification of Spatial Integrity Constraints in Pictorial Databases", Computer, vol. 22, no. , pp. 59-71, December 1989, doi:10.1109/2.42032
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