Topology Level
Level 0
- Topological data has been provided, but at least 2 <Feature Node> instances are located at the same position.
Level 1
- All <Feature Node> instances have unique <Location> coordinates.
Level 2
- <Feature Edge> instances intersect only at <Feature Node>s.
Level 3
- Regular <Feature Face>s touch only at common boundary edges.
- Every <Feature Face> indicates which <Feature Node> instances are located within its boundaries.