Patent Number: 7,711,726

Title: Method, system and program for creating an index

Abstract: A method for creating an index for searching a structured document having a document data-structure stored, in a computer. The method to be performed in the computer for creating an index includes the steps of: analyzing a structured document to extract a document data-structure in the structured document; normalizing the extracted document data-structure to create a logical structure index composed of a plurality of elements having a hierarchical structure; extracting an appearance number of each element in the created logical structure index; and extracting elements for creating the index, based on the logical structure index, by comparing the extracted element appearance number and a first predetermined threshold.

Inventors: Iijima; Michio (Tokyo, JP), Nakano; Yukio (Oyama, JP)

Assignee: Hitachi, Ltd.

International Classification: G06F 17/00 (20060101)

Expiration Date: 5/04/12018