Unified Modeling Language Reference Manual, The, Second Edition

Generalization

The generalization relationship is a taxonomic relationship between a more general description and a more specific description that builds on it and extends it. The more specific description is fully consistent with the more general one (it has all its properties, members, and relationships) and may contain additional information. For example, a mortgage is a more specific kind of loan. A mortgage keeps the basic characteristics of a loan but adds additional characteristics, such as a house as security for the loan. The more general description is called the parent; an element in the transitive closure is an ancestor. The more specific description is called the child; an element in the transitive closure is a descendant. In the ...