10.1.3 Relations and Arcs

Relation

Relations must be identifiers, and they must exist in the relation hierarchy.

Relations are always dyadic, meaning that they always have one incoming and one outgoing arc.

Arcs

Arcs can turn one of two ways. Using the "agnt" relation as an example:

[Source Concept]-agnt->[Target Concept]

or:

[Target Concept]<-agnt-[Source Concept]

Note how there is as "dash" ('-') on one side, and an "arrow" on the other ('<-' or '->'). You cannot have an arrow on both sides!


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