7. The indexing file of claim 5 , wherein the indexing file includes, in addition to said first and second pair, other pairs each consisting of a listing identifier of a listing and a score indicative of a degree of strength with which that listing includes characteristics that are consistent with the first uniquely identified listing feature, and wherein the first, second and other pairs are organized, within the indexing file, in descending or ascending order based on said score included in each pair.
5. A computer implemented method for generating an index file for supporting a directory assistance service, the method comprising: utilizing a computer processor that is a functional component of the computer to generate an indexing file that contains a first collection of pairs for a first uniquely identified listing feature, wherein first collection of pairs includes a first pair consisting of a listing identifier and a first score, the first score being indicative of a degree of strength with which a first listing identified by the first listing identifier includes characteristics that are consistent with the first uniquely identified listing feature, wherein generating the index file such that the first collection pairs also includes a second pair consisting of a second listing identifier and a second score, the second score being indicative of a degree of strength with which a second listing identified by the second listing identifier includes characteristics that are consistent with the first uniquely identified listing feature, wherein the first collection of pair includes a separate and distinct pair for every listing in the index that includes the listing feature, each separate and distinct pair including a listing identifier and a score, and wherein all of the separate and distinct pairs in the first collection of pairs are listed, within the indexing file, in an order that is at least partially contingent upon an evaluation of a value of the score in each separate and distinct pair; wherein generating the indexing file such that the indexing file includes, for each of the individual features in said listing, a set of score that represent a degree of strengths of correlation between the individual feature and each listing in the index; identifying a plurality of query features associated by the query; assigning one of said unique query identifiers to each of the plurality of query features; cross referencing, into the indexing file, the unique query identifiers assigned to each of the plurality of query features; and creating a ranking that factors a set of scores included in the indexing file with the cross referenced unique query identifiers.