VegCore vegpath.org/VegCore/ERD.pdf: PDF version of the ERD base_class referenced_class: referenced_class derived_class source party plot geo event method community occurrence individual specimen taxon < plot occurrence > source record relationship party party_list party_list_entry organization place rel_place plot subplot georeferencing geoplace geopath scrubbed_geoplace geovalidation event sampling_event project method stratum place_observation soil_observation community geological_context taxon_observation taxon_absence taxon_presence aggregate_observation reobservable individual individual_observation stem stem_observation collection specimen specimen_observation taxon_determination taxon_assertion taxon_name taxon_path taxon_concept taxon_string taxon_scrub