( OBJECT TestAlgebras () ( rel ( tuple ( ( AlgNo int ) ( Alg string )))) ( ( 1 "StandardAlgebra" ) ( 2 "FunctionAlgebra" ) ( 3 "RelationAlgebra" ) ( 4 "ExtRelationAlgebra" ) ( 5 "PointRectangleAlgebra" ) ( 6 "StreamExampleAlgebra" ) ( 7 "PolygonAlgebra" )))