ECs in the ABSTRACT_OBJECT group

ECC_APERTURE	ECC_BENCH	ECC_BUOY	ECC_CELESTIAL_BODY
ECC_CENTRE_LINE	ECC_COMPONENT	ECC_DATUM	ECC_DEVICE
ECC_EQUIPMENT	ECC_FLEXIBLE_RESTRAINT	ECC_FURNITURE	ECC_LIGHT
ECC_MAN_MADE_OBJECT	ECC_MARINE_OBJECT	ECC_MARKER	ECC_MATERIAL
ECC_MESH	ECC_NATURAL_AIR_OBSTRUCTION	ECC_NETWORK	ECC_NON_EMPTY_SET
ECC_OBJECT	ECC_OBJECT_SET	ECC_ORNAMENT	ECC_RELATED_OBJECT_SET
ECC_SATELLITE	ECC_SET	ECC_SURFACE	ECC_SYSTEM
ECC_TABLE	ECC_TERRAIN_SURFACE_OBJECT	ECC_TIME_ANALYSIS_BASE_SET	ECC_TIME_FORECAST_TAU_SET
ECC_UNDERWATER_OBJECT