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Summary: Entities, relationships, is_a, has, and assignment
The framework we've laid out so far will allow us to model quite a bit about the world. For example, we can model the following:
 | Daniel is_a man |
| man is_a person |
| person has_a age |
| Daniel.age = 27 |
| person has_a first_name |
| Daniel.first_name = "Daniel" |
| person has_a last_name |
| Daniel.last_name = "Bigham" |
| 0.4: man has:0 wife |
| 0.6: man has:1 wife |
| Daniel has:1 wife |
| wife is_a woman |
| woman is_a person |
| Meredith is_a wife |
| Daniel.wife = Meredith |
| Meredith.first_name = "Meredith" |
| Meredith.last_name = "Bigham" |
| 0.4: person has:0 sister |
| 0.6: person has:(>:0) sister |
| Daniel has:2 sister |
| sister is_a woman |
| Rebekah is_a sister |
| Hannah is_a sister |
| Daniel.sister[0] = Rebekah |
| Daniel.sister[1] = Hannah |
| Rebekah.first_name = "Rebekah" |
| Rebekah.last_name = "de Bueger" |
| Hannah.first_name = "Hannah" |
| Hannah.last_name = "Bigham" |
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