From TDWG Terms Wiki
No type definition was found for "Gathering-DateTime-ISODateTimeBegin" in the abcd2 import.
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The collecting date of the sample as YYYYMMDD. Missing data (MM or DD) should be indicated with hyphens. Leading zeros are required. A FAO/IPGRI multi-crop passport descriptor (MCPD), description and examples taken from EURISCO descriptor list dated July 3, 2002.
Constraints in the context of ABCD 2:
- cardinality 0..1 (=optional single occurrence)