links for 2008-10-21

• OWL Web Ontology Language Guide
  The World Wide Web as it is currently constituted resembles a poorly mapped geography. Our insight into the documents and capabilities available are based on keyword searches, abetted by clever use of document connectivity and usage patterns. The sheer mass of this data is unmanageable without powerful tool support. In order to map this terrain more precisely, computational agents require machine-readable descriptions of the content and capabilities of Web accessible resources. These descriptions must be in addition to the human-readable versions of that information.
  (tags: semanticweb reference semantic Programming howto AI Language metadata rdf architecture Standards ontology w3c tutorial development Guide semantic_web semweb xml owl semantic-web Specification protege standard ontologies)
• Racer Renamed Abox and Concept Expression Reasoner
  Robust Server for Scalable Ontology Reasoning
  Racer handles large Aboxes in combination with large and expressive Tboxes. It provides highly optimized standard and non-standard inference services for sophisticated ontology applications. Racer offers much more than OWL by supporting rules, constraint reasoning, and expressive query answering (e.g., in SPARQL syntax). The Racer query language nRQL (new Racer Query Language, pronounce: niracle and hear as miracle) offers grounded conjunctive queries with head projection operators, negation as failure, aggregation operators, and server-side processing of query results (e.g., XML generation) Data persistency is provided by referring to AllegroGraph, an extremely fast triple store providing access to billions of triples.
  (tags: Software semanticweb tools Research semantic Programming AI ontology KM rdf semantic_web owl semantic-web reasoner inference reasoners logic protege racer)
• SKOS Simple Knowledge Organization System – home page
  Simple Knowledge Organization System – about standard knowledge organization for the web and semantic web, porting thesauri, classification schemes, taxonomies, glossaries, vocabularies, controlled vocabularies, terminology, terminologies, subject schemes, subject heading schemes, subject indexing, subject indexes, folksonomies, to the semantic web, semantically rich metadata, describing concepts, conceptual information, concept maps, semantic mapping, Knowledge Organization Systems, KOS, for the world wide web, using RDF the Resource Description Framework, complementing OWL the Web Ontology Language, integrating with XML Extensible Markup Language.
  (tags: S thesaurus semanticweb semantic community Language metadata Knowledge rdf Standards ontology w3c KM semantic_web semweb xml Specification taxonomy web skos classification folksonomy semantic-web tagging owl)
• Semantic Networks
  This is a revised and extended version of an article that was originally written for the Encyclopedia of Artificial Intelligence, edited by Stuart C. Shapiro, Wiley, 1987, second edition, 1992.
  A semantic network or net is a graphic notation for representing knowledge in patterns of interconnected nodes and arcs. Computer implementations of semantic networks were first developed for artificial intelligence and machine translation, but earlier versions have long been used in philosophy, psychology, and linguistics.
  (tags: semanticnetwork semanticnetworks sowa semanticweb computer Article AI Articles network Networks ontology Knowledge semantic_web semweb rdf semantic reference)
• Knowledge Representation Book
  John F. Sowa, Knowledge Representation: Logical, Philosophical, and Computational Foundations, Brooks Cole Publishing Co., Pacific Grove, CA, ©2000. Actual publication date, 16 August 1999.
  (tags: Sowa Knowledge Representation semantic semanticweb Article IA AI Networks)