| ++Philosurfical: |
| •owl:Thing |
| •PHILOSURFICAL-ENTITY |
| •CRM-ENTITY |
| •TEMPORAL-ENTITY |
| •PERIOD |
| •EVENT |
| •ACTIVITY |
| •SOCIAL-ACTIVITY |
| •CLOSE-SOCIAL-CONTACT |
| •MAIL-EXCHANGE |
| CLOSE-SOCIAL-CONTACT |
| HAS-ITEM-SENT ONLY INFORMATION-CARRIER |
| HAS-RECEIVER ONLY PERSON |
| HAS-SENDER ONLY PERSON |
| CARRIED-OUT-BY ONLY PERSON |
| HAD-PARTICIPANT ONLY PERSON |
Class(MAIL-EXCHANGE partial CLOSE-SOCIAL-CONTACT
restriction(HAS-ITEM-SENT allValuesFrom(INFORMATION-CARRIER))
restriction(HAS-RECEIVER allValuesFrom(PERSON))
restriction(HAS-SENDER allValuesFrom(PERSON))
restriction(CARRIED-OUT-BY allValuesFrom(PERSON))
restriction(HAD-PARTICIPANT allValuesFrom(PERSON)))