link
A tuple of object references that is an instance of an association or of a connector.
Semantics
A link is an individual connection among two or more objects. It is a tuple (ordered list) of object references. It is an instance of an association. The objects must be direct or indirect instances of the classes at corresponding positions in the association. An association may contain duplicate links from the same association—that is, two identical tuples of object references—only if one of the ends is specified as a bag (including a list).
A link that is an instance of an association class may have a list of attribute values in addition to the tuple of object references. Duplicate links with the same tuple object references are not permitted, ...
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