The papers cover the following topics: semantic web rule languages and standards, rule engines, formal and operational semantics and rule-based systems, the relation between natural language and rules, automation of business rules generation from existing data, and aspects related to legal rules and norms for web and corporate environments.

Reaction RuleML 1.0 for Rules, Events and Actions in Semantic Complex Event Processing.- A Logical Characterization of a Reactive System Language.- On Using Semantically-Aware Rules for Efficient Online Communication.- Conceptual Model Interoperability: A Metamodel-driven Approach.- On Verifying Reactive Rules Using Rewriting Logic.- Using Rules to Develop a Personalized and Social Location Information System for the Semantic Web.- Checking Termination of Logic Programs with Function Symbols through Linear Constraints.- A Datalog+ RuleML 1.01 Architecture for Rule-Based Data Access in Ecosystem Research.- A Hybrid Diagnosis Approach Combining Black-Box and White-Box Reasoning.- Multi-valued Argumentation Frameworks.- Incomplete and Uncertain Data Handling in Context-Aware Rule-Based Systems with Modified Certainty Factors Algebra.- The Hardness of Revising Defeasible Preferences.- From Guidelines to Practice: Improving Clinical Care through Rule-Based Clinical Decision Support at the Point of Care.- Requirement Compound Mining and Analysis.- Semi-automated Vocabulary Building for Structured Legal English.- Basics for a Grammar Engine to Verbalize Logical Theories in isiZulu.- Formal Rule Representation and Verification from Natural Language Requirements Using an Ontology.- Learning Business Rules with Association Rule Classifiers.- Interpreting Web Shop User’s Behavioral Patterns as Fictitious Explicit Rating for Preference Learning.- Learning Association Rules from Data through Domain Knowledge and Automation.- Using Discriminative Rule Mining to Discover Declarative Process Models with Non-atomic Activities.- Modeling Obligations with Event-Calculus.- A Process for Knowledge Transformation and Knowledge Representation of Patent Law.- Legal Responsibility for the Acts of Others: A Logical Analysis.