| ++Philosurfical: Class that refers to encounters or other contacts between two persons only |
| •owl:Thing |
| •PHILOSURFICAL-ENTITY |
| •CRM-ENTITY |
| •TEMPORAL-ENTITY |
| •PERIOD |
| •EVENT |
| •ACTIVITY |
| •SOCIAL-ACTIVITY |
| •CLOSE-SOCIAL-CONTACT |
Class(CLOSE-SOCIAL-CONTACT partial SOCIAL-ACTIVITY
restriction(HAS-FREQUENCY allValuesFrom(FREQUENCY-OF-OCCURENCE))
restriction(HAD-PARTICIPANT allValuesFrom(PERSON)))