ILOG OPL Development Studio Language Reference Manual

ConstraintsSpecifies the constraints supported by OPL and discusses various subclasses of constraintsto illustrate the support available for modeling combinatorial optimization applications.In this sectionIntroductionProvides an overview of the use of constraints in OPL.Using constraintsExplains how to apply a constraint to a decision variable and, possibly, conditionalize it, whyidentify constraints by a label, and why use constraints for filtering purposes.Constraint labelsExplains why label constraints, the benefits, costs, and limitations, how to label constraints,how to use indexed labels, and how to deal with compatibility between constraint names andlabels.Types of constraintsDescribes constraint classification depending on their operand type.I L O G O P L D E V E L O P M E N T S T U D I O L A N G U A G ER E F E R E N C E M A N U A L105