ReadonlyexpressGet express ID of the parent element
ReadonlyifcGet IFC type name (e.g., "IfcDoor", "IfcWindow")
ReadonlyisCheck if this is a closed loop
ReadonlypointGet number of points
ReadonlypointsGet 2D points as Float32Array [x1, y1, x2, y2, ...]
ReadonlyrepGet representation identifier ("Plan", "Annotation", "FootPrint", "Axis")
ReadonlyworldWorld-Y elevation captured from the placement chain (or first 3D point's Z component). JS uses this as the canonical bucket key.
A single 2D polyline for symbolic representations (Plan, Annotation, FootPrint) Points are stored as [x1, y1, x2, y2, ...] in 2D coordinates