A schematic diagram of Option 4: Occurrence Core combined with MoF Extension; each sampling event is documented as a separate record in the Occurrence Core. The diagram shows that this format allows efficient storage of both biotic and abiotic measurements in the same DwC-A, but it increases complexity by introducing an event record without associated occurrence information into the Occurrence Core.

  
  Part of: De Pooter D, Appeltans W, Bailly N, Bristol S, Deneudt K, Eliezer M, Fujioka E, Giorgetti A, Goldstein P, Lewis M, Lipizer M, Mackay K, Marin M, MoncoiffĂ© G, Nikolopoulou S, Provoost P, Rauch S, Roubicek A, Torres C, van de Putte A, Vandepitte L, Vanhoorne B, Vinci M, Wambiji N, Watts D, Klein Salas E, Hernandez F (2017) Toward a new data standard for combined marine biological and environmental datasets - expanding OBIS beyond species occurrences. Biodiversity Data Journal 5: e10989. https://doi.org/10.3897/BDJ.5.e10989