Given a free text review, since it may cover various opinions on multiple aspects, we first locate the opinionated expression modifying each aspect, and determine the opinion on the aspect using the learned SVM classifier.
since the opinionated expression on each aspect tends to contain sentiment terms and appear closely to the aspect (Hu and Liu, 2004), we select the expressions which contain sentiment terms and are at the distance of less than 5 from the aspect NP in the parsing tree.