Datalog-related aspects in lixto visual developer

Abstract

Lixto Visual Developer is an integrated development environment specifically geared towards the visual development of Web data extraction programs, supporting complex navigation and extraction tasks on highly dynamic Web applications. Internally, created extraction rules are reflected in a declarative extraction language called Elog, which relies on a datalog syntax and semantics. It is ideally suited for representing and successively incrementing the knowledge about patterns described by application designers. In this paper, we illustrate aspects of the Visual Developer and the Elog language exploiting some examples. © 2011 Springer-Verlag.