System for, and method of, ranking search results obtained by searching a body of data records

A weighting processor for ranking search results obtained by searching a body of data records,

• wherein the weighting processor is adapted to review the search results using one or more selected search terms from a taxonomy, the taxonomy comprising search terms
• having associated metadata which, for each search term, identifies a category and includes a measure of relatedness to at least one different search term in the same category, based on co-occurrences of the search terms in individual ones of a plurality of data records,
• the weighting processor having an input to receive the one or more selected search terms and being adapted to review each data record of the search results by, for each selected search term, summing the measures of relatedness of each different search term of the taxonomy present in the data record, and to rank the search results at least partially according to the summed measures of relatedness for each individual data record of the search results.