Definition: A collection of distinct structures which function
together to carry out some task, as the respiratory
enzyme complex on mitochondrial membranes. Souther.
Required Relationships:
There are no slots that are required for an ensemble.
Other Common Relationships:
element:
the individual entities that comprise the ensemble.
number-of-elements:
the number of elements in the ensemble
Examples:
the emsemble of 3 musicians playing or singing together
number-of-elements: three
Comment:
It is not necessary to specify a number-of-elements or to list the
element of an ensemble. If you do, the system will try
to maintain consistency by requiring that the number of element
is at least as large as the specified number-of-elements