Structured t Unstructured data Key idea: optimal parse of (unstructured offer wrt specification Semantic parse of offers tagging Use inverted index built on specification values Tag all n-grams product line 大 ran model Panasonic Lumix DMC-FX07 digital camera 7.2 megapixel, 2.5",3.6X, LCD monitor resolution zoom diagonal, display type height, widthStructured + Unstructured Data  Key idea: optimal parse of (unstructured) offer wrt specification  Semantic parse of offers: tagging – Use inverted index built on specification values – Tag all n-grams 15 Panasonic Lumix DMC-FX07 digital camera 7.2 megapixel, 2.5”, 3.6x, LCD monitor brand product line model resolution diagonal, height, width zoom display type