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No type definition was found for "Gathering-Depth" in the abcd2 import.
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This depth should be positive below the surface and negative above (e.g. collecting above sea level in tidal areas).
Although the depth could be covered by a generic element for site measurements, the separate Depth element is preserved for the sake of clarity.
Constraints in the context of ABCD 2:
- cardinality 0..1 (=optional single occurrence)