- CLOSURE_POINT : Parma_Polyhedra_Library::Generator
- EQUALITY : Parma_Polyhedra_Library::Constraint
- LINE : Parma_Polyhedra_Library::Grid_Generator, Parma_Polyhedra_Library::Generator
- NONSTRICT_INEQUALITY : Parma_Polyhedra_Library::Constraint
- PARAMETER : Parma_Polyhedra_Library::Grid_Generator
- POINT : Parma_Polyhedra_Library::Grid_Generator, Parma_Polyhedra_Library::Generator
- RAY : Parma_Polyhedra_Library::Generator
- STRICT_INEQUALITY : Parma_Polyhedra_Library::Constraint