Method of reducing search space complexity using suggested search terms with display of an associated reduction factor

摘要

Indexing of a large dataset is performed by providing a search space including the dataset. For the search space, a lexicon of search terms is determined for those elements within the search space associated with terms within the lexicon. For some of the terms within the lexicon a secondary search space is determined. Then for each secondary search space, a further secondary lexicon of secondary search terms for those elements within said secondary search space associated with terms within the secondary lexicon is determined.