3.7.16. Assignment
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A constraint related to assignment problems (i.e., ),
or a constraint putting a restriction on all items that are assigned
to the same equivalence class or on all equivalence classes that are
actually used.
Usually an equivalence class corresponds to a single value
(see, e.g., the ,
,
, and
constraints),
to an interval of consecutive values
(see, e.g., the ,
, and
constraints)
or to all values that are congruent modulo a given number
(see, e.g., the constraint).
The restriction on all items that are assigned to the same equivalence
class can for instance be a constraint on the number of items
(see, e.g., the ,
,
, and
constraints)
or a constraint on the sum of a specific attribute
(see, e.g., the , and
constraints).