Abstract
This paper describes an Object-Oriented extension to RuleML as a modular combination of three sublanguages. (1) User-level roles provide frame-like slot representations as unordered argument collections in atoms and complex terms. (2) URI-grounded clauses allow for ‘webizing’ using URIs as object identifiers for facts and rules. (3) Order-sorted terms permit typed variables via Web links into taxonomies such as RDF Schema class hierarchies, thus reusing the Semantic Web’s light-weight ontologies. Besides introducing the first sublanguage with the Positional-Roled (ASCII) syntax, all three sublanguages are introduced with the OO RuleML (XML) syntax. Their semantics are sketched and their implementation paths are discussed.
Thanks to Michael Schroeder and Gerd Wagner for inviting me to give this RuleML’03 presentation. I also want to express my gratitude to Michael Sintek and Said Tabet for valuable contributions on several topics of this paper. Said Tabet, Benjamin Grosof, and the RuleML Steering Committee have encouraged me early on regarding the OO RuleML design. Bruce Spencer has supported the development of OO RuleML, its implementations, as well as the PR rule language. Marcel Ball and Stephen Greene gave valuable hints and performed various OO RuleML and PR syntax implementations. OO RuleML has already been employed outside the RuleML team by Virendra Bhavsar (AgentMatcher project) and Daniel Lemire (RACOFI project); further applications are being planned, e.g. by Anna Maclachlan (Metaxtract project). This research was funded by NRC as part of the Sifter project.
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Boley, H. (2003). Object-Oriented RuleML: User-Level Roles, URI-Grounded Clauses, and Order-Sorted Terms. In: Schröder, M., Wagner, G. (eds) Rules and Rule Markup Languages for the Semantic Web. RuleML 2003. Lecture Notes in Computer Science, vol 2876. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39715-1_1
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