| 摘要 |
PROBLEM TO BE SOLVED: To efficiently retrieve a document over plural document schemata. SOLUTION: The device is constituted of a schema storing means for storing document schemata, a document storing means 2 for storing documents satisfying the syntax rules of document schemata, a schema specifying means 3 for specifying a document schema using the syntax rule of a document schema used for an inquiry as a partial set of its own syntax rule from a document schema group stored in the means 1, a document retrieval control means 4 for outputting a specified document schema group, and a document retrieving means 5 for retrieving documents satisfying an inquiry condition from documents stored in the means 2 correspondingly to the specified document schema group. Thus documents satisfying a condition related to elements appearing on a syntax rule shared by plural document schemata and a condition related to connection relation among plural elements are retrieved by a single inquiry and a document having a document schema including no syntax rule is previously removed from documents to be retrieved. |
