1. A method comprising: determining a strength of a correspondence between a search query and a title of a listing of an item on a network-based publication system, the search query including a keyword, the determining of the strength of correspondence based on an analysis of a set of actions previously taken by a set of users after submitting a set of previous search queries including the keyword; generating a set of annotations corresponding to the search query, the generating including identifying a type of the item and a confidence measure pertaining to the identifying of the type of the item; propagating the set of annotations to a search engine for use in enhancing search results generated by the search engine; and presenting the enhanced search results generated by the search engine, the enhanced search results including a filtering of the search results based on the type of the item and the confidence measure.
1. A method comprising: determining a strength of a correspondence between a search query and a title of a listing of an item on a network-based publication system, the search query including a keyword, the determining of the strength of correspondence based on an analysis of a set of actions previously taken by a set of users after submitting a set of previous search queries including the keyword; generating a set of annotations corresponding to the search query, the generating including identifying a type of the item and a confidence measure pertaining to the identifying of the type of the item; propagating the set of annotations to a search engine for use in enhancing search results generated by the search engine; and presenting the enhanced search results generated by the search engine, the enhanced search results including a filtering of the search results based on the type of the item and the confidence measure. 3. The method of claim 1 , wherein the strength of the correspondence is based on rankings of types of the set of actions, the types of the set of actions including viewing the listing of the item, watching the listing of the item, bidding on the item, or purchasing the item.