Conceptual Dependency (CD)
This representation is used in natural language processing in order to represent them earning of the sentences in such a way that inference we can be made from the sentences. It is independent of the language in which the sentences were originally stated. CD representations of a sentence is built out of primitives , which are not words belonging to the language but are conceptual , these primitives are combined to form the meaning s of the words. As an example consider the event represented by the sentence.
In the above representation the symbols have the following meaning:
Arrows indicate direction of dependency
Double arrow indicates two may link between actor and the action
P indicates past tense
ATRANS is one of the primitive acts used by the theory . it indicates transfer of possession
0 indicates the object case relation
R indicates the recipient case relation
Conceptual dependency provides a str5ucture in which knowledge can be represented and also a set of building blocks from which representations can be built. A typical set of primitive actions are
ATRANS - Transfer of an abstract relationship(Eg: give)
PTRANS - Transfer of the physical location of an object(Eg: go)
PROPEL - Application of physical force to an object (Eg: push)
MOVE - Movement of a body part by its owner (eg : kick)
GRASP - Grasping of an object by an actor(Eg: throw)
INGEST - Ingesting of an object by an animal (Eg: eat)
EXPEL - Expulsion of something from the body of an animal (cry)
MTRANS - Transfer of mental information(Eg: tell)
MBUILD - Building new information out of old(Eg: decide)
SPEAK - Production of sounds(Eg: say)
ATTEND - Focusing of sense organ toward a stimulus (Eg: listen)
A second set of building block is the set of allowable dependencies among the conceptualization describe in a sentence.
