Abstract
We describe the Constraint Object Data Model (CODM), which enhances an object-based data model with existential constraints to naturally represent partially specified information. We present the Constraint Object Query Language (COQL), a declarative, rule-based, language that can be used to infer relationships about and monotonically refine information represented in the CODM. COQL has a model-theoretic and a fixpoint semantics based on the notions of constraint entailment and “proofs in all possible worlds”. We also provide a novel polynomial-time algorithm for quantifier elimination for set-order constraints, a restricted class of set constraints that uses ε and ⊑.
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© 1994 Springer-Verlag Berlin Heidelberg
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Srivastava, D., Ramakrishnan, R., Revesz, P.Z. (1994). Constraint objects. In: Borning, A. (eds) Principles and Practice of Constraint Programming. PPCP 1994. Lecture Notes in Computer Science, vol 874. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-58601-6_103
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DOI: https://doi.org/10.1007/3-540-58601-6_103
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