In natural language, and in some knowledge representation systems, such as extended logic programs, there are two kinds of negation: a weak negation expressing non-truth, and a strong negation expressing explicit falsity. In this paper I argue that, like in several basic computational languages, such as OCL and SQL, two kinds of negation are also needed in the Semantic Web.

In the last few years negation and speculation scope classification systems have been developed successfully, most of them using machine–learning approaches. In this paper we present a competitive system that finds the scope of negation and speculation in sentences for English by means of syntactic dependency analysis without using machine–learning. A greedy algorithm first detects the cues (le...

Oppositeness refers to the paradigmatic relationship of two words holding the contrast meanings. The fact that linguistic opposite differs from logical contrast has been discussed in theories, but has not been tested in practice. In this paper, we investigate three main subtypes of Chinese oppositeness, via using logical tests of negation and double-negation. Result shows that purely logical te...