1. A machine implemented method comprising: receiving by a search engine, from a content searching or consuming application, an atomic search term, the search engine and the content searching or consuming application being operated on one or more different or same computing devices; generating in response, by the search engine, one or more scores indicative of relative relevance of a content or one or more portions of the content to the atomic search term, the generating by the search engine being based at least in part on a structure, a distance function, and a scoring function, the structure structurally describing the content, the distance function measuring distances between sub-structures within the structure, and the scoring function being positionally sensitive, yielding different scores for different occurrence positions of the atomic search term in the content; and conditionally providing or not providing the content or one or more portions of the content, or access information of the content or one or more portions of the content, to the content searching or consuming application, by the search engine, based at least in part on the generated one or more scores.