Describe with example the concept of constraint on link.

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written 5.9 years ago by

teamques10 ★ 69k

Constraints:

A constraint represents some condition, restriction or assertion related to some element (that owns the constraint) or several elements.
Constraint is usually specified by a Boolean expression which must evaluate to a true or false.
Constraint must be satisfied (i.e. evaluated to true) by a correct design of the system.
Constraints are commonly used for various elements on class diagrams.
Constraints are functional relation between entities of an object model.
Entity includes objects, classes, attributes, links and associations.
A constraint restricts the values that entities can assume.
Simple constraints may be placed in object models and complex may be in functional model.

Example:

Constraint:

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