3.1.2.1 The Creation of a Relation Connection
In order to add the relational specification, “John is the friend of Marc.” to the knowledge structure the generalization word “John” must be connected to specification “friend” through a specification connection containing a reference to relation “Marc”.
Thus there is one specification connection used containing a second reference. This special specification connection is called a relation specification connection, or a relation connection for short.
The relation connection must be read as: “John” has a “friend” relation with “Marc”. The same goes for “Bush” and “Obama” who have a “president” relation with the “United States of America”.
In the sentence, “John is the friend of Marc and Paula.”, two relation connections are created stemming from “John”. Both include the specification “friend”, but one has a relation reference to “Marc” and one to “Paula.”.