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:
Aug. 20, 2002
Filed:
Mar. 31, 1999
Awny K. Al-omari, Santa Clara, CA (US);
Hansjorg Zeller, Los Altos, CA (US);
Diana L. Shak, San Jose, CA (US);
Compaq Computer Corporation, Cupertino, CA (US);
Abstract
The present invention reduces the compile time in a top-down rule based system by identifying the complexity of a query prior to applying a rule to an expression. If the complexity of the query is above a threshold, the present invention determines whether the rule should be applied based upon several factors including the type of rule and the position of the node in the search space. Those rules that need not be applied are randomly pruned at a determined rate that prevents search space explosion and prevents the elimination of large contiguous portions of the search space. Pruned rules are not applied, while those rules that are not pruned are applied.