2.3 Belongs to, attached to
An arc is said to belong to a relation but to be attached to a concept. This is useful terminology, and will be used throughout the remainder of these notes.
For example, in the graph
[Say]->(Thme)->[Phrase: "Nightie-night"] "Say 'Nightie-night'"the two arcs belong to the relation "(Thme)", while they are attached to the two concepts "[Say]" and "[Phrase: "Nightie-night"]".
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