Document database management device and document database management method

摘要

PURPOSE: To make it easy to judge the adequacy of a retrieval expression by collating a document type with the conditions that are specified with the retrieval expression and use parent-child and descendant relation. CONSTITUTION: A correspondence table holding part 9 holds a correspondence table which has as entries three sets of elements (starting element), elements (adjacent element set) appearing as children of the starting element, and a set (reachable element set) of elements that can be reached from the starting elements. Further, a correspondence table generation part 10 refers to the structure of a specified document type as to the document type and generates the correspondence table. A reaching possibility decision part 11 when given two elements which are a source and a destination scans the correspondence table held at the correspondence table holding part 9 to inspect whether or not the destination is included in the adjacent element set or reachable element set of an entry based upon an entry as a starting element. When a structured document is retrieved, collation is performed under conditions which are specified with the retrieval expression and use the parent-child and descendant relation to judge whether or not the retrieval expression is adequate.