OverviewThe meta-knowledge corpus is an extension of the GENIA Event corpus annotation, created by the National Centre for Text Mining (NaCTeM).The meta-knowledge corpus adds an extra level of annotation to the GENIA Event corpus, which encodes the interpretation of each event according to its textual context. To illustrate the type of annotation performed, consider the examples below. In each sentence, the event (triggered by the verb activate and its participants (narL gene product as the CAUSE and nitrate reductase operon as the THEME) are identical, although the way in which the events should be interpreted is different in each case.
In sentence 1), the word known tells us that the event is a generally accepted fact,
while in 2), the interpretation is completely different. The word examined denotes that the
event is under investigation, and hence the truth value of the event is unknown. The presence of the word
not in sentence 3) shows that the event is negated, i.e. it did not happen. In sentence 4),
the verb suggest, together with its subject adds further speculation regarding the truth of the event.
The word partially in sentence 4) does not challenge the truth of the event, but rather conveys the
information that the strength or intensity of the event is less than may be expected by default.
Finally, the phrase previous studies in sentence 5) shows that the event is based on information available
in previously published papers, rather than relating to new information from the current study. Example
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