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The document retrieval system includes a storage for storing keyword relationships which indicate relationship values of keywords and relations of the keywords and registered documents , an input part for designating a retrieval condition including one or plurality of designated keywords , where the retrieval condition determines a registered document which is to be retrieved from the storage , a selector for selecting a plurality of keyword relationships based on the retrieval condition and for converting the selected keyword relationships into analog signals , an analog operation circuit for calculating a relevance of document based on the analog signals , and a converter for converting the calculated relevance of document into a digital value . The system writes all the sentences matching the query in an HTML report , where the matched keywords are highlighted . If those protocols can be implemented , they will solve many of the problems linked to the above mentioned keywords " specificity " and " persistence " . The currently selected region is defined by the preceding select or restrict command and not the atom expression containing the selected keyword . Let us adopt travel as the selected keyword . The first ones are called keywords in a2ps jargon , and the seconds are operators . C is a language of few words , containing only a handful of terms , called keywords , which serve as the base on which the language 's functionality is built . Contract lines will be presented in keyword , contract number , and contract line number order for a desired keyword .