| PARKA | ⊕ 1989 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| PARMENIDES | ⊕ 1989 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| THEO | ⊕ 1989 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | Learning frame language |