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Ontolog invited Speaker Presentation - Dr. Leo Obrst - Thu 2006-01-12 & Thu 2006-01-19     (1)

  • Subject: Ontolog Invited Speaker Presentation by Leo Obrst - Part-1: Thu 2006-01-12, Part-2: Thu 2006-01-19     (1A1)
  • Agenda: Dr. Leo Obrst of MITRE, and a co-convener of the Ontolog Forum, will be presenting to the community. His talk is entitled: "What is an ontology? - A Briefing on the Range of Semantic Models"     (1A2)
  • Date: Part-1: Thursday, January 12, 2006; Part-2: Thursday, January 19, 2006     (1A3)
  • Start Time: 10:30 AM PST / 1:30 PM EST / 18:30 UTC (Part-2 start time, see world clock for other time zones)     (1A4)
  • Dial-in Number: 1-702-851-3330 (Las Vegas, Nevada)     (1A5)
  • Shared-screen support (VNC session) will be started 5 minutes before the call at:     (1A6)
    • view-only password: "ontolog"     (1A6A)
    • if you plan to be logging into this shared-screen option (which the speaker may be navigating), and you are not familiar with the process, please try to call in 5 minutes before the start of the session so that we can work out the connection logistics. Help on this will generally not be available once the presentation starts.     (1A6B)
    • people behind corporate firewalls may have difficulty accessing this. If that is the case, please download the slides below and runing them locally. The speaker will prompt you to advance the slides during the talk.     (1A6C)
  • Please note that this session will be recorded, and the audio archives is expected to be made available as open content to our community membership and the public at-large under our prevailing open IPR policy.     (1A10)

Part-1 session - Attendees     (1B)

Part-2 session - Attendees     (1C)

Agenda & Proceedings     (1E)

  • Dr. Leo Obrst of MITRE, and a co-convener of the Ontolog Forum, will be presenting to the community. His talk is entitled: "What is an ontology? - A Briefing on the Range of Semantic Models"     (1E1)
LeoObrst_20060112.png [picture of Dr. Leo Obrst]     (1E2)
Abstract: (by LeoObrst)     (1E3)
The Ontology Spectrum describes a range of semantic models of increasing expressiveness and complexity: taxonomy, thesaurus, conceptual model, and logical theory.     (1E4)
This presentation initially describes the Ontology Spectrum and important distinctions related to semantic models, e.g., the distinction among term, concept, and real world referent; the distinction among syntax, semantics, and pragmatics; the distinction between intension and extension; and de facto distinctions that the ISO 11179 standard makes (as do many others): data objects, classification objects, terminology objects, meaning objects, and the relationships among these.     (1E5)
The individual semantic model types are then discussed: weak and strong taxonomies, thesauri, and weak and strong ontologies (conceptual model and logical theory, respectively). Each of these are defined, exemplified, and discussed with respect to when a more expressive model is needed.     (1E6)
If time permits, semantic integration and interoperability are discussed with respect to the models.     (1E7)
Finally, a pointer to an expansion of the logical theory portion of the Ontology Spectrum is given: the Logic Spectrum, which describes the range of less to more expressive logics used for ontology and knowledge representation.     (1E8)
  • Session Format and Agenda:     (1E9)
    • this will be virtual session over a phone conference setting, augmented by shared computer screen support     (1E9A)
    1. Part-1: The session will start with a brief self-introduction of the attendees (~10 min.)     (1E10A)
    2. Introduction of the Invited Speaker by Peter P. Yim     (1E10B)
    3. Presentation by the invited speaker (80 min.)     (1E10C)
    4. Part-2: we'll skip introductions and move straight into the continuation of the pressentation (45~60 min.)     (1E10D)
    5. Q & A and Open discussion (~30 min.)     (1E10E)
Leo Obrst is a principal artificial intelligence scientist at MITRE��s ( Center for Innovative Computing and Informatics, where he leads the Information Semantics group (semantics, ontological engineering, knowledge representation and management), and has been involved in projects on Semantic Web rule/ontology interaction, context-based semantic interoperability, ontology-based knowledge management, conceptual information retrieval, metadata and thesaurus construction for community knowledge sharing, intelligent agent technology, and ontology-based modeling of complex decision-making, He was recently Director of Ontological Engineering at, a department he formed to create ontologies in the product and service space to support Business-to-Business e-commerce. Leo's PhD is in theoretical linguistics with a concentration in formal semantics from the University of Texas-Austin. He has worked over 20 years in computational linguistics, knowledge representation, and in the past nine years in ontological engineering. Leo is a member of the Executive Committee of the National Center for Ontological Research (NCOR,, and the chair of the NCOR Technical Committee. He was a member of the W3C Web Ontology Working Group ( that developed the Web Ontology Language OWL. He is a member of the IEEE Standard Upper Ontology working group (, the Semantic Web Services Initiative (, the Ontolog community (, which he co-founded and which focuses on the promotion of ontological engineering and semantic technologies), and the W3C Rule Interoperability group. He is a member of AAAI, ACL, LSA, and ACM. His research interests include semantic interoperability/integration, formalization of context for ontology mapping and merging, and formal upper ontologies, Semantic Web rules, and the application of formal ontology and formal semantics to ontological engineering.     (1E12)
  • If you have questions for the presenter, we appreciate your posting them here: (please identify yourself)     (1E14)
    • ...(insert content here) ...     (1E14A)
    • ... (post you questions here, the speaker will be fielding them during the open discussion session) ...     (1E14B)

Session Recording of the Leo Obrst Talk     (1F)

(Thanks to Kurt Conrad, Bob Smith and Peter P. Yim for their help with getting the session recorded. -ppy)     (1F1)

This page has been migrated from the OntologWiki - Click here for original page     (1F5)