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Table 1 Summary of the main features of the discussed approaches.

From: Towards improving phenotype representation in OWL

Feature EQ RP RC RQ
A role information no yes yes yes
B unlimited arity of relations no (yes) yes yes yes
C variable arity of relations no yes yes yes
D straight-forward database support yes partially partially partially
E max. nr. of relevant vocabulary 2/0 0/n + 1 2/n + 1 X + 1/n + 2
F add. characterization of relations no no no yes
  1. Abbreviations of the approaches: EQ: entity-quality, RP: roles-as-properties, RC: roles-as-classes, RQ: relator-based-quality. The entry of '(yes)' in line B, column EQ, reflects the discussed extensibility of EQ. The numbers in line E count vocabulary elements (OWL properties or classes) introduced in each approach. The first number is the number of fixed elements (applicable to all relational qualities), in case of EQ this is two for inheresIn and towards. The second number is the maximal number of elements required per n-ary relational quality, e.g. n OWL properties encoding n roles and 1 OWL class encoding the relation itself for RP. The variable X in column RQ stands for the respective number of the RP or RC columns, depending on the relation model that is combined with RQ.