Preface
The RuleML Challenge competitions started in 2007, so the RuleML-2009 Challenge, collocated in Las Vegas, Nevada, with Rule Interchange and Application (RuleML 2009) was the third year of the rule system Challenge competition. The objective of this year’s event was to inspire the issues of system implementation for management, integration, interoperation and interchange of rules in an open distributed environment, such as the Web.
Rules are usually classified as: deductive rules, normative rules, and reactive rules. In addition, the reactive rules can be further classified as Event-Condition-Action (ECA) rules and production rules. Recently, the issue of combination rule and ontology has become one of the most important research problems in the Semantic Web. Once we consider enforcing computer executable policies as a set of declarative rule and ontology that guide the behavior of entities within a system, we have a flexible way to implement real world policies without rewriting the computer code. However, the interoperability of the computer policies is still a big challenge in the heterogeneous environment.
Fortunately, we have de facto rule markup languages, e.g.
RuleML or RIF to achieve the portability and interchange of rules for computer executable policies using different rule systems. Otherwise, it is impossible to execute rule-based real-life applications on the Web. Several commercial or open source rule engines were available for the rule-based
applications. However, we still need a standard rule language and benchmark for not only to compare the rule systems but also to measure the progress in this field.
For the past two RuleML Challenge competitions, only a minimum set of requirements were given for evaluating the submitted demo systems. The criteria were that declarative rules should have to play a central role in the application, and the demo
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