geometry
POLYGON ZM ((30 10 40 300, 40 40 80 1600, 20 40 60 800, 10 20 30 200, 30 10 40 300))
POLYGON ZM ((35 10 45 350, 45 45 90 2025, 15 40 55 600, 10 20 30 200, 35 10 45 350), (20 30 50 600, 35 35 70 1225, 30 20 50 600, 20 30 50 600))

POLYGON ZM EMPTY