Invited Talks.- P 6= P: Why Some Reasoning Problems are More Tractable Than Others.- Semantic Technologies in Selected Industrial Applications.- Web Reasoning for Cultural Heritage.- Full Papers.- Planning with Transaction Logic.- A Generalization of Approximation Fixpoint Theory and Application.- Query Answering over Contextualized RDF/OWL Knowledge with For all-Existential Bridge Rules: Attaining Decidability using Acyclicity.- Exchange-Repairs: Managing Inconsistency in Data Exchange.- Rules and Ontology Based Data Access.- Technical Communications.- Semantic Search for Earth Observation Products using Ontology Services.- Airport Context Analytics.- Navigating among Educational Resources in the Web of Linked Data.- Investigating Information Diffusion in a Multi-Social-Network Scenario via Answer Set Programming.- Web Stream Reasoning Using Probabilistic Answer Set Programming.- Federated Debugging of Lightweight Ontologies.- Revisiting the Hardness of Query Answering in Expressive Description Logics.- An Ontology for Container Terminal Operations.- Posters.- Ontology-Based Answer Extraction Method.- Collective, Incremental Ontology Alignment Through Query Translation.- Disjunctive Constraints in RDF and Their Application to Context Schemas.- Linked Open Data in the Earth Observation Domain: the Vision of Project LEO.- Combining Fuzzy and Probabilistic Reasoning for Crowd-Sourced Categorization and Tagging.- Doctoral Consortium.- Visual Editor for Answer Set Programming: Preliminary Report.- Adaptive Stream Query Processing Approach for Linked Stream Data: Extended Abstract.-Combining Logic and Business Rule Systems.