Lesson 20 - Module 8 Other representation formalisms...

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Module 8 Other representation formalisms Version 1 CSE IIT, Kharagpur
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Lesson 20 Frames - I Version 1 CSE IIT, Kharagpur
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8.4 Frames Frames are descriptions of conceptual individuals. Frames can exist for ``real'' objects such as ``The Watergate Hotel'', sets of objects such as ``Hotels'', or more ``abstract'' objects such as ``Cola-Wars'' or ``Watergate''. A Frame system is a collection of objects. Each object contains a number of slots . A slot represents an attribute. Each slot has a value. The value of an attribute can be another object. Each object is like a C struct. The struct has a name and contains a bunch of named values (which can be pointers) Frames are essentially defined by their relationships with other frames. Relationships between frames are represented using slots . If a frame f is in a relationship r to a frame g , then we put the value g in the r slot of f . For example, suppose we are describing the following genealogical tree: The frame describing Adam might look something like: Adam: sex: Male spouse: Beth child: (Charles Donna Ellen) where sex , spouse , and child are slots. Note that a single slot may hold several values ( e.g. the children of Adam).
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