| ++Philosurfical: Class that refers events about a person formally and intentionally taking part in a group |
| •owl:Thing |
| •PHILOSURFICAL-ENTITY |
| •CRM-ENTITY |
| •TEMPORAL-ENTITY |
| •PERIOD |
| •EVENT |
| •ACTIVITY |
| •SOCIAL-ACTIVITY |
| •JOINING-A-GROUP |
Class(JOINING-A-GROUP partial SOCIAL-ACTIVITY
restriction(GROUP-JOINED allValuesFrom(GROUP)))