Using part-of relationship and the Web (Popescu and Etzioni, EMNLP-05)
Improved (Hu and Liu, KDD-04) by removing those frequent noun phrases that may not be features: better precision (a small drop in recall).
It identifies part-of relationship
Each noun phrase is given a pointwise mutual information score between the phrase and part discriminators associated with the product class, e.g., a scanner class.
The part discriminators for the scanner class are, “of scanner”, “scanner has”, “scanner comes with”, etc, which are used to find components or parts of scanners by searching on the Web: the KnowItAll approach, (Etzioni et al, WWW-04).