Invited Papers -- The Maturing Semantic Web: Lessons in Web-Scale Knowledge Representation -- Concept Formation in Linguistic Ontologies -- Conceptual Graph Rules and Equivalent Rules: A Synthesis -- Two Paradigms Are Better Than One, and Multiple Paradigms Are Even Better -- Semantic Search - Using Graph-Structured Semantic Models for Supporting the Search Process -- Human Being and Mathematics Logical and Mathematical Thinking -- Accepted Papers -- Default Conceptual Graph Rules: Preliminary Results for an Agronomy Application -- Towards Extraction of Conceptual Structures from Electronic Health Records -- Algorithm Design Using Traversals of the Covering Relation -- Representing and Reasoning about Different Viewpoints: An Agronomy Application -- Access Policy Design Supported by FCA Methods -- Using VRML Technology for Visualization of Relations between the Main Concepts of an Educational Course -- Efficient Browsing and Update of Complex Data Based on the Decomposition of Contexts -- In Search of Semantic Compositionality in Vector Spaces -- Frequent Itemset Mining for Clustering Near Duplicate Web Documents -- System Consequence -- Fusion of Claude Bernard's Experiments for Scientific Discovery Reasoning -- Distinguishing Answers in Conceptual Graph Knowledge Bases -- A Practical Exploration of Ontology Interoperability -- Relation Algebra Operations on Formal Contexts -- Conceptual Graphs and Datatypes -- Towards the Complexity of Recognizing Pseudo-intents -- Another Reason Why Conceptual Graphs Need Actors -- Relational Scaling in Relational Semantic Systems.

This book constitutes the refereed proceedings of the 17th International Conference on Conceptual Structures, ICCS 2009, which took place in Moscow, Russia, on July 26-31, 2009. The 18 papers presented together with 5 invited contributions were carefully reviewed and selected from approximately 50 submissions. Originally centered around research on knowledge representation and reasoning with conceptual graphs, over the years ICCS has broadened its scope to include innovations from a wider range of theories and related practices, among them other forms of graph-based formalisms like RDF or existential graphs, formal concept analysis, semantic Web technologies, ontologies, concept mapping and more.