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Formal languages involve many concepts such as string, grammar and semantics which are able to be described by “Categories”. This paper provides two categories which are used for grammar and semantics in a context-free language, and the syntax analysis issue has been discussed in detail. This information may be useful for researcher concerning formalization methods.
Event as the unit of human knowledge, has attracted more and more attention and high regards from the academia. Events-based knowledge extraction and representation extend concept-based knowledge process techniques largely. In order to represent event-based knowledge, this paper extends existing web ontology language, OWL, by introducing some new constructors and axioms related to event features....
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