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Upper Ontology Summit March 14, 2006

This paper discusses the goals of the Upper Ontology Summit, which includes developing methods to relate existing upper ontologies and creating a common subset ontology. The paper also explores the relationships between ontologies and the requirements for ontology generalization. Additionally, it introduces the Process Specification Language (PSL) and its modular extensions for process specification.

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Upper Ontology Summit March 14, 2006

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  1. Upper Ontology SummitMarch 14, 2006 Michael Gruninger Semantic Technologies Laboratory University of Toronto

  2. Goals • Develop methods to relate the existing upper ontologies to each other. • Create a common subset ontology that is compatible with all of the linked upper ontologies.

  3. Relationships among Ontologies • Theory T1 generalizes theory T2 if and only if T1 is definably interpretable in a theory T3 and T2 is a consistent extension of T3. • Problem: Given two theories T1 and T2, determine whether there exists a nontrivial theory that generalizes both.

  4. Requirements • What do we need so that we can prove that one ontology is a generalization of another? • the ontology must consist of a consistent set of axioms • the ontology must axiomatize its intended models • Evaluation of the relationships between ontologies is made using their axioms alone; it cannot rely on intended models of concepts that are not axiomatized. • If the axioms of an ontology are insufficient to capture their users' intended semantics, then there is little progress that can be made towards integration

  5. Process Specification Language • PSL (ISO 18629) is a modular, extensible ontology capturing concepts required for process specification • There are currently 300 concepts across 50 extensions of a common core theory (PSL-Core), each with a set of first-order axioms written using Common Logic (ISO 24707). • Two kinds of extensions: • Core theories • Definitional extensions

  6. Modularity and PSL Activity Occurrences Complex Activities Atomic Activities Discrete States Subactivity Occurrence Trees PSL-Core

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