Related to obophenotype/cell-ontology#1481

Currently CL uses custom relations:
http://purl.obolibrary.org/obo/cl#has_completed
http://purl.obolibrary.org/obo/cl#has_not_completed
This seems to refer to cells that have/have not completed some GO biological process
Would be good to move this to RO.

rdfs:label has completed
definition: a relation between a material entity and a process in which the material entity exists, at least in part, due to the completion of the process.
Example of usage: memory T cell has_completed some 'memory T cell differentiation'

rdfs:label has not completed
definition: a relation between a material entity and a process in which the material entity has the potential to complete the process, but has yet to complete it.
Example of usage: immature T cell has_not_completed some 'T cell selection'