An ER conceptual schema can be expressed in a suitable description logic theory.A role in DL jargon is a property in OWL.A concept in DL jargon is referred to as a class in OWL.DL vs OWL (from Description Logic Wikipedia):.Good for representing most interesting domains, but inference is not only expensive, but may not terminate. First-order logic: we can now talk about objects and relations between them, and we can quantify over objects.The more restricted the representational power, the faster the inference in general. Logics differ in terms of their representation power and computational complexity of inference.Complexity - resources needed for computing the solution.Decidability of entailment problem - there exists a (terminating) algorithm to compute entailment.Completeness of entailment procedure - all correct conclusions are drawn.Correctness of entailment procedure - no false conclusions are drawn.Expressive Power of representation language - able to represent the problem.Reasoning: logical inference, "processing knowledge" (implicit knowledge has to be made explicit).Logic: a well formalized part of agent knowledge and reasoning.Wikipedia article on description logics.Description logics (DL) are a family of knowledge representation languages which can be used to represent the terminological knowledge of an application domain in a structured and formally well-understood way.Artificial Intelligence: A Modern Approach - this book describes the nature of knowledge, its representation, inference based on knowledge, and many other topics (sample chapters available online).BIONLP - natural language processing of biology text] - Bob Futrelle's page.EBIMed is a web application that combines Information Retrieval and Extraction from Medline.Arrowsmith explores the causes of disease.BioText - infrastructure to support the development and deployment of statistical approaches to natural language processing, which will identify entities and relations between them in bioscience texts.gnowsis the Semantic Desktop environment.Principles of Knowledge Representation and Reasoning, Incorporated (KR, Inc.) is a Scientific Foundation incorporated in the state of Massachusetts of the United States of America concerned with fostering research and communication on knowledge representation and reasoning.IBM Systems Journal - Knowledge Management.Part 7: Review and relevance of the techniques discussed.Parl 2: Combining files into an RDF model, and basic RDF querying.Thinking XML: Basic XML and RDF techniques for knowledge management.COMP30411: Knowledge Representation class at the University of Manchester.Software for mindmapping and information organisation.vym - View Your Mind - free mind mapping software.Mind map is a diagram used to represent words, ideas, tasks or other items linked to and arranged radially around a central key word or idea.IHMC CmapTools - empowers users to construct, navigate, share and criticize knowledge models represented as concept maps Concept maps is a diagram showing the relationships among concepts.Semantic network is a directed graph consisting of vertices which represent concepts and edges which represent semantic relations between the concepts - a form of knowledge representation.What is a Knowledge Representation? by Randall Davis, MIT AI Lab. ![]() Wikipedia article on knowledge representation.
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