On a Declarative Semantics for Web Queries
Rainer Himmeröder, Bertram Ludäscher
Abstract. Languages supporting deduction and
object-orientation are particularly suited for querying and reasoning
about the Web structure and the contents of semistructured (Web)
documents. We show how FLORID, an implementation of the deductive
object-oriented query language F-Logic, can be extended to provide a
declarative semantics for querying Web documents. The proposed
extension allows extraction and restructuring of data from the Web
and a seamless integration with local data. Due to a simple yet
powerful predicate for matching regular expressions, and the
(meta-)features of F-logic including path expressions, separate
languages for wrappers and mediators become superfluous in our
approach. The concise, declarative programming style is illustrated
with a comprehensive example.
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