Semantic Constraints in a Medical Information System
نویسندگان
چکیده
Classical constraint handling in data processing systems is concerned with ensuring the integrity of the database. Constraints are usually based on attribute values in a domain, or on syntactic (structural) relationships between the number of values under one attribute related to one under another. In the area of medical informatics, and probably in other application areas, the classical types of constraint are insufficient to ensure the integrity required. Semantic constraints—which rely on the meaning of the attribute value—are needed. A knowledge representation formalism called Structured Meta Knowledge (SMK) is presented which describes conceptual medical terms and their occurrences in individual patient records. The requirements for constraints in medical informatics are matched against classical constraint types, the extensions defined and compared with those existing in SMK. A scheme for constraints in medical informatics is proposed, and future directions indicated.
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