Composition

The composition type indicates how a sequence of coordinates need to be interpreted.

The GeoDMS supports two composition types:

1. arc: an arc consists of at least a start and end point and 0 or more intermediates per entry.
2. poly or polygon: a polygon consist of at least three points per entry, the last and first point need to be the same to create a closed polygon. The composition type poly is also used to indicate multiple elements in sequence functions.

The composition type is configured for feature attributes of arcs and polygons with the keyword arc or polygon in the same brackets as the domain unit. A comma separates domain units and the composition type, the order is irrelevant.

For point feature attributes no composition type has to be configured.