The final thing that a concept referent can be is a multi-referent. Multi-referents are used to specify that two or more concepts are really the same concept.
The syntax of a multi-referent is:
for example, "*1" or "*2" ... up to "*9".
When we write the same multi-referent in two spatially separate concepts, we are thereby indicating that this really is the same concept.
Entity > Animal, Act. Act = Say. // An animal is talking to itself SpeechAct([Animal : *1]<-AGNT-[Act : Say]-RCPT->[Animal : *1]).
This example is available in the AAU directory as Aesop4.plgCG.
The SpeechAct fact says that an animal is talking to itself. The referent of both [Animal] concepts is the multi-referent *1, so the concept is really the same concept internally in the machine. Graphically, this would look as follows:
Note how this is different from coreference:
It is the former, not the latter, we are representing with multi-referents.
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