They propose a scheme which first identifies and assigns categories to the opinion segments as reporting, judgment, advice, or sentiment; and then links the opinion segments with each other via rhetorical relations including contrast, correction, support, result, or continuation.
in contrast to our scheme and other schemes, instead of marking expression boundaries without any restriction they annotate an opinion segment only if it contains an opinion word from their lexicon, or if it has a rhetorical relation to another opinion segment.