geometry
POLYGON M ((30 10 300, 40 40 1600, 20 40 800, 10 20 200, 30 10 300))
POLYGON M ((35 10 350, 45 45 2025, 15 40 600, 10 20 200, 35 10 350), (20 30 600, 35 35 1225, 30 20 600, 20 30 600))

POLYGON M EMPTY