Frames

• A structure that is often used in KR systems is frames.
• It's like a semantic net, but instead of unitary nodes, the nodes have structure.
• These structures are like records with slots and values. (It's like a methodless class.)
• This is the preferred mechanism for representing the semantics of a sentence (Fillmore's case theory).
• It can also be used for a lot of more structured items, like football players, cars, and clothes.
• It can also take advantage of inheritence.