10. A system comprising: at least one processor; and one or more memories storing computer readable instructions that, when executed by the at least one processor, direct the system to perform acts comprising: extracting one or more item lists from one or more webpages of a plurality of web pages resulting from execution of a search query based at least on one or more list pattern identification techniques, the one or more list pattern identification techniques including identifying terms that are in parallel positions in a sentence or continuous lines according to a text pattern in a respective web page of the one or more web pages as a respective item list of the one or more item lists, the respective item list of the one or more item lists including two or more related words or phrases included in the respective web page of the one or more web pages, wherein at least one of the two or more related words or phrases is related to the search query and does not include a keyword for the search query; weighting each of the one or more item lists; clustering the weighted one or more item lists based on a determination that at least some of the item lists include one or more similar items; and generating, based at least in part on the clustering, one or more query dimensions that summarize a characteristic of the search query, at least one of the one or more query dimensions comprising a plurality of items from a cluster of weighted item lists.
10. A system comprising: at least one processor; and one or more memories storing computer readable instructions that, when executed by the at least one processor, direct the system to perform acts comprising: extracting one or more item lists from one or more webpages of a plurality of web pages resulting from execution of a search query based at least on one or more list pattern identification techniques, the one or more list pattern identification techniques including identifying terms that are in parallel positions in a sentence or continuous lines according to a text pattern in a respective web page of the one or more web pages as a respective item list of the one or more item lists, the respective item list of the one or more item lists including two or more related words or phrases included in the respective web page of the one or more web pages, wherein at least one of the two or more related words or phrases is related to the search query and does not include a keyword for the search query; weighting each of the one or more item lists; clustering the weighted one or more item lists based on a determination that at least some of the item lists include one or more similar items; and generating, based at least in part on the clustering, one or more query dimensions that summarize a characteristic of the search query, at least one of the one or more query dimensions comprising a plurality of items from a cluster of weighted item lists. 15. The system of claim 10 , wherein the one or more list pattern identification techniques further comprise at least one of: one or more metadata tag patterns; and one or more repeated region patterns.