1. A method for extracting quotations related to a product from a document, comprising: building a span query relevant to a feature associated with the product and a sentiment about the feature by: building syntactic templates from a lexicography relevant to the feature and the sentiment about the feature, wherein each syntactic template corresponds to multiple phrasings of the same meaning, and determining a first semantic template relevant to the syntactic templates; receiving a document; applying the span query to the document to generate a span query result, wherein the span query result includes a quotation from the document relevant to the feature and the sentiment about the feature, the quotation satisfying the first semantic template and including words within relative positions as constrained by the span query; and storing the span query result.
1. A method for extracting quotations related to a product from a document, comprising: building a span query relevant to a feature associated with the product and a sentiment about the feature by: building syntactic templates from a lexicography relevant to the feature and the sentiment about the feature, wherein each syntactic template corresponds to multiple phrasings of the same meaning, and determining a first semantic template relevant to the syntactic templates; receiving a document; applying the span query to the document to generate a span query result, wherein the span query result includes a quotation from the document relevant to the feature and the sentiment about the feature, the quotation satisfying the first semantic template and including words within relative positions as constrained by the span query; and storing the span query result. 10. The method of claim 1 wherein determining a first semantic template relevant to the syntactic template comprises: building at least one atomic semantic template from the syntactic template; and building a complex semantic template from the at least one atomic semantic template wherein the complex semantic template comprises at least one prohibitive clause, the at least one prohibitive clause comprising an expression relevant to the feature that does not convey sentiment.