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:
Apr. 16, 2019
Filed:
Aug. 31, 2015
Semmle Limited, Oxford, GB;
Ian Lynagh, Oxford, GB;
Semmle Limited, Oxford, GB;
Abstract
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for evaluating recursive predicates and exiversal predicates. One of the methods includes receiving an expression having an exiversal quantifier that specifies a condition x and a condition y. The expression is transformed into a second expression having multiple recursive calls, the second expression having a first non-negated term with a first recursive call in the condition y, and a second negated term with a second recursive call in the condition y. The second expression is evaluated using evaluation predicates that include a single delta predicate that replaces only the recursive call in the first non-negated term to identify data elements in the relation having at least one attribute satisfying the condition x and the condition y, and, for each attribute of the data element satisfying the condition x, the attribute also satisfies the condition y.