O'Reilly logo

Unified Modeling Language Reference Manual, The, Second Edition by Grady Booch, Ivar Jacobson, James Rumbaugh

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

n-ary association

An association among three or more classes. Contrast: binary association.

Semantics

Each instance of the association is an n-tuple of values, one from each of the respective classes. A single class may appear in more than one position in the association, but the values in the different positions are independent and need not be the same object. A binary association is a special case with its own simpler notation and certain additional properties that are meaningless (or at least hopelessly complicated) for an n-ary association.

Multiplicity for n-ary associations may be specified but is less obvious than binary multiplicity. The multiplicity on an association end represents the potential number of values at the end, when the ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required