. Author manuscript; available in PMC: 2017 Jun 1.

Published in final edited form as: J Biomed Inform. 2016 Mar 14;61:63–76. doi: 10.1016/j.jbi.2016.03.007

Table 4.

Commonality of the three structural features used to derive the structural meta-ontology.

Structural Feature (Usage)	# of Ontologies	% (n=373)
Directed Acyclic Graph	228	61.1%
Tree	145	38.9%
Object property	279	74.8%
Object property (Defined domain)	185	49.6%
Object property (Restriction)	224	60.1%
Data property	123	33.0%
Data property (Defined domain)	117	31.4%
Data property (Restriction)	39	10.5%

Note: The first column shows the structural features considered in this study. Within parenthesis is the usage of the structural feature. The second column indicates the total number of ontologies that exhibit the particular structural feature and usage. The third column provides the percentage of ontologies in the study that have the feature (# of Ontologies / 737)