ILOG OPL Development Studio Language Reference Manual

Filtering with constraintsIn addition to applying constraints to decision variables, you can also create constraints onformal parameters to filter aggregates, like this:Filtering with constraints// The cities where we are doing business{string} cities={"Paris","Berlin","Washington","Rio"};{string} EuropeanMainCapitals = {"London","Paris","Berlin","Madrid","Roma"};// Should we expand business in this city ?dvar boolean x[cities];// We want to expand business in Europemaximize sum(c in cities: c in EuropeanMainCapitals) x[c];subject to{// We can expand business in 2 citiessum(c in cities) x[c]