The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2008
Filed:
Oct. 31, 2003
Audrey L. Balmin, San Diego, CA (US);
Kevin S. Beyer, San Jose, CA (US);
Roberta JO Cochrane, Los Gatos, CA (US);
Fatma Ozcan, San Jose, CA (US);
Mir Hamid Pirahesh, San Jose, CA (US);
Audrey L. Balmin, San Diego, CA (US);
Kevin S. Beyer, San Jose, CA (US);
Roberta Jo Cochrane, Los Gatos, CA (US);
Fatma Ozcan, San Jose, CA (US);
Mir Hamid Pirahesh, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for using pre-computed information stored in auxiliary structures to speed up processing of expensive queries on hierarchical documents such as XML documents being queried using XPath. The invention defines a taxonomy of such structures such as indexes and materialized views for storing pre-computed XPath results (PXRs), determines what portion of the query can be evaluated by the structures, and computes the compensation for the results generated by the structures. The invention detects all structures applicable to the query and rewrites the query to use such structures, speeding up the performance of the queries. The invention identifies the matching structures by detecting containment mappings between XPath expressions in the query and the structure. The invention also includes a new representation for XPath expressions that is rich enough to express all features of XPath.