Semantic Data Model
Conceptual data model; Conceptual model
A semantic data model represents data in terms of named sets of objects, named sets of values, named sets of relationships, and constraints over these object, value, and relationship sets. The semantics of a semantic data model are the intensional declarations: the names for object, value, and relationship sets that indicate intended membership in the various sets and the declared constraints that the data should satisfy. The data of a semantic data model is extensional and consists of instances of object identifiers and values for object and value sets and of m-tuples of instances for m-ary relationship sets. The model of a semantic-data-model instance describes intensionally a real-world domain of interest. The modeling components of the semantic data model specify the modeling elements from which a real-world model instances can be built.
For a general description of semantic data models, see . This entry describes the...