24. The method of claim 17 , wherein the search expression further comprises a third atomic sub-expression proximally associated with the proximally associated first and second atomic sub-expressions, and the generating being associatively sensitive yielding different scores for different associations of the proximally associated first, second and third atomic sub-expressions.
17. A machine implemented method comprising: receiving by a search engine, from a content searching or consuming application, a search expression having a first and a second proximally associated atomic sub-expression, the search engine and the content searching or consuming application being operated on one or more different or same computing devices; receiving a content page nominally associated with the search expression, or access information of the content page, by the search engine; generating in response, by the search engine, one or more scores for one or more structures of the content page indicative of relative relevance of the content page or one or more portions of the content page to the search expression, wherein a structure includes substructures, wherein the generating of a score for a structure is based at least in part on a distance function and a scoring function, wherein the distance function measures distances between sub-structures within the structure being scored to facilitate determining of mutual relevance of occurrence positions, and wherein the scoring function is positionally sensitive, yielding different scores for at least a first and a second situation where the distance between the occurrence positions of the first and second proximally associated atomic sub-expressions is same in both the first and second situations, when the occurrence positions of the first proximally associated atomic sub-expression have no category membership or same category membership in the first and second situations, and the occurrence positions of the second proximally associated atomic sub-expression have no category membership or same category membership in the first and second situations; and conditionally providing or not providing the content page or one or more portions of the content page, or access information of the content page or one or more portions of the content page, to the content searching or consuming application, by the search engine, based at least in part on the generated one or more scores.