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Table 3 The relations used for mapping underlying taxonomic concepts

From: Making species checklists understandable to machines – a shift from relational databases to ontologies

Relation between taxa Intensive Ostensive Notation Properties
Congruent Share the same characters Share the same species A=B Symmetric, transitive
Part of All characters of a taxon are included in another taxon All species are included in another taxon AB Non-symmetric, transitive
Overlap At least one character is shared between taxa, but not all of them At least one species is shared between taxa, but not all of them AB,AB Symmetric, non-transitive
  1. The division into intensional and ostensive relations [35] is only available in TaxMeOn (not in the Taxonomic Database).