The following features are demonstrated in this example:
problem type: linear programming (network flow with side constraints)
sets of tuples
reading multiple data sets
set operators UNION, SETOF, and DIFF
INIT option
implicit slice
using a colon (:) to select members of a set
.body
constraint suffix
.ub
constraint suffix
.dual
constraint suffix
multiple objectives and the OBJ option
ALGORITHM= option