Table 1.
Translation of OBO aspects into OWL.
| OBO stanza | OWL | Required/Optional |
| name | OWL-DL class name | required |
| id | Extra-logical | required |
| alt_id | Extra-logical | optional |
| namespace | OWL namespace | optional |
| definition | Extra-logical | optional |
| comment | Extra-logical | optional |
| subset | Extra-logical | optional |
| related_synonym | "Some values from" restriction on related_synonym | optional |
| exact_synonym | Equivalent class | optional |
| broad_synonym | Superclass | optional |
| narrow_synonym | Subclass | optional |
| xref_analog | Extra-logical | optional |
| xref_unknown | Extra-logical | optional |
| is_a | Subclass | optional |
| relationship | "Some values from" restriction on object property | optional |
| is_obsolete | Extra-logical | optional |
| use_term | Object property | optional |
| domain | domain | optional |
| range | range | optional |
| is_cyclic | (see Section 6) | optional |
| is_transitive | transitive | optional |
| is_symmetric | symmetric | optional |