Constraints represent restrictions imposed on the decision variables (the set of alternatives). They can be used to eliminate from consideration alternatives characterized by certain attributes and/or certain values of attributes. Thus constraint maps display the set of feasible alternatives.
Malczewski 1999, p. 112
Criterion Map
2008-06-06T00:00:00Z ^^ http://www.w3.org/2001/XMLSchema#dateTime
Factor Map
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