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by Manuel Kolp, Alain Pirotte
http://www.cs.toronto.edu/~mkolp/sem_rel_notes.pdf
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Abstract:
– object a is related to object b by being close or next to a – proximity can be conceptual or physical • Common Values: – object a is related to object b if both have some common attribute value – typical of the relational model • Pointer-Valued Attributes: – object a is related to object b if an attribute value of a points at b – typical of most common object-oriented models (e.g., C++, ODMG) • Independent Links: – object a is related to object b if both a and b participate in a special relationship structure (object) distinct from a and b – typical of ER, hyperlink, semantic modeling systems c○2000 Manuel Kolp Semantic Relationships 3 Relationships as Relations or Mappings • As Relations: Subset of the Cartesian product of two (or more) sets • Set of tuples between the objects of the related classes • Can be viewed as objects Company employs
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