5. An apparatus that enhances relevance ranking of results in a search of a corpus of documents having in part homogeneous structured data having a field structure, using an underlying search engine offering a distribution-biased OR operator, the apparatus comprising: processing circuitry configured to a. as a preparatory phase, before a request function receives any queries, based on knowledge of the field structure of the documents to be searched and the content of some of the fields, determine a mapping or policy for automatically, by a processor, replacing a received search clause with a sequence of multiple search clauses of anticipated nested respective responsive scopes, such that a set of documents responsive to one search clause in the sequence of search clauses is predicted to be a subset of the set of documents responsive to the next search clause in the sequence of search clauses; b. on an ongoing basis, operate at a search-controller level to mediate between the request function and an underlying search engine, and electronically receive a query comprising at least one search clause from the request function; c. transform, according to the mapping or policy determined in preparatory-phase step (a), at least one of the at least one received search clause received in step (b) into an automatically generated, intentionally redundant sequence of search clauses representing the anticipated nesting of respective responsive scopes designed in the step (a) mapping or policy, so as to correspond to gradations of focus on a topic of interest interpreted to be suggested by the at least one received search clause; d. combine the generated sequence of search clauses with a distribution-biased OR operator and submit the combination to the underlying search engine to be executed against a database associated with the search engine, wherein scoring of the distribution-biased OR operation reflects not only aggregate scoring from respective counts of matches for the alternate clauses under the distribution-biased OR but also the evenness of distribution of that aggregate across its contributing component scores coming from those respective alternate clauses; e. automatically execute the submitted combination of search clauses, by the underlying search engine, such that the nesting of the individual clauses' respective responsive scopes induces the underlying search engine to return a set of responsive documents for the entire OR combination that corresponds to the responsive set for the broadest of the submitted, automatically generated sequence of individual search clauses; and f. automatically relevance-score the broad set of responsive documents returned in step (e), via the underlying search engine's processing of the distribution-biased OR-connected sequence of search clauses automatically generated and submitted in steps (c) and (d), yielding scoring more sensitive to gradations of focus on a topic of interest as suggested in the at least one search clause received in step (b).
5. An apparatus that enhances relevance ranking of results in a search of a corpus of documents having in part homogeneous structured data having a field structure, using an underlying search engine offering a distribution-biased OR operator, the apparatus comprising: processing circuitry configured to a. as a preparatory phase, before a request function receives any queries, based on knowledge of the field structure of the documents to be searched and the content of some of the fields, determine a mapping or policy for automatically, by a processor, replacing a received search clause with a sequence of multiple search clauses of anticipated nested respective responsive scopes, such that a set of documents responsive to one search clause in the sequence of search clauses is predicted to be a subset of the set of documents responsive to the next search clause in the sequence of search clauses; b. on an ongoing basis, operate at a search-controller level to mediate between the request function and an underlying search engine, and electronically receive a query comprising at least one search clause from the request function; c. transform, according to the mapping or policy determined in preparatory-phase step (a), at least one of the at least one received search clause received in step (b) into an automatically generated, intentionally redundant sequence of search clauses representing the anticipated nesting of respective responsive scopes designed in the step (a) mapping or policy, so as to correspond to gradations of focus on a topic of interest interpreted to be suggested by the at least one received search clause; d. combine the generated sequence of search clauses with a distribution-biased OR operator and submit the combination to the underlying search engine to be executed against a database associated with the search engine, wherein scoring of the distribution-biased OR operation reflects not only aggregate scoring from respective counts of matches for the alternate clauses under the distribution-biased OR but also the evenness of distribution of that aggregate across its contributing component scores coming from those respective alternate clauses; e. automatically execute the submitted combination of search clauses, by the underlying search engine, such that the nesting of the individual clauses' respective responsive scopes induces the underlying search engine to return a set of responsive documents for the entire OR combination that corresponds to the responsive set for the broadest of the submitted, automatically generated sequence of individual search clauses; and f. automatically relevance-score the broad set of responsive documents returned in step (e), via the underlying search engine's processing of the distribution-biased OR-connected sequence of search clauses automatically generated and submitted in steps (c) and (d), yielding scoring more sensitive to gradations of focus on a topic of interest as suggested in the at least one search clause received in step (b). 7. The apparatus of claim 5 wherein the at least one received search clause is in the form <value> in <field> and the automatically generated sequence of search clauses replacing the at least one received search clause are in the form <value_1> in <field>; <value_2> in <field>; . . . <value_N> in <field>, and where <value_1>, <value_2>, . . . <value_N> are each distinct sets of one or more values replacing the original <value> and are automatically chosen based on the original <value>.