The REWERSE Rule Markup Language (R2ML) is developed by the REWERSE Working Group I1 for the purpose of rules interchange between different systems and tools.

• An XML based rule language;
• Support for: integrity rules, derivation rules, production rules and reaction rules;^{[citation needed]}
• Integrate functional languages (such as OCL) with Datalog languages (such as SWRL);
• Serialization and interchange of rules by specific software tools;
• Integrating rule reasoning with actual server side technologies;
• Deploying, publishing and communicating rules in a network.

• Modeled using MDA;
• Rule concepts defined with the help of MOF/UML;
• Required to accommodate:
  • Web naming concepts, such as URIs and XML namespaces;
  • The ontological distinction between objects and data values;
  • The datatype concepts of RDF and user-defined datatypes;
• Actions (following OMG PRR submission);
• Events;
• EBNF abstract syntax;
• XML based concrete syntax validated by an XML Schema;
• Allowing different semantics for rules.

• Ontology (computer science)
• Business rules
• Business rules approach
• RuleML
• Semantic Web Rule Language

• REWERSE
• Rule Interchange Format WG
• RuleML