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There is rapidly growing momentum for web enabled agents that reason about and dynamically integrate the appropriate knowledge and services at run-time. The World Wide Web Consortium and the DARPA Agent Markup Language (DAML) program have been actively involved in furthering this trend. The dynamic integration of knowledge and services depends on the(More)
Introduction Ontologies are becoming increasingly important because they provide the critical semantic foundation for many rapidly expanding technologies such as software agents, e-commerce and knowledge management (McGuinness, 2001). The Unified Modeling Language (UML) 1 has been widely adopted by the software engineering community and its scope is(More)
There is rapidly growing momentum for web enabled agents that reason about and dynamically integrate the appropriate knowledge and services at run-time. The dynamic integration of knowledge and services depends on the existence of explicit declarative semantic models (ontologies). We have been building tools for ontology development based on the Unified(More)
The DARPA Agent Markup Language (DAML) is an emerging knowledge representation for the Semantic Web. DAML can encode the semantics of a document for use by agents on the web. However, DAML annotation of documents and web pages is a tedious and time consuming task. AeroDAML is a knowledge markup tool that applies natural language information extraction(More)
Ensuring that ontologies are consistent is an important part of ontology development and testing. This is especially important when autonomous software agents are to use ontologies in their reasoning. Reasoning with inconsistent ontologies may lead to erroneous conclusions. In this paper we introduce the ConsVISor tool for consistency checking of(More)
As the use of Semantic Web ontologies continues to expand there is a growing need for tools that can validate ontological consistency and provide guidance in the correction of detected defects and errors. A number of tools already exist as evidenced by the ten systems participating in the W3C's evaluation of the OWL Test Cases. For the most part, these(More)
In this paper we propose an extension of the service oriented architecture that supports discovery of Web services across organization boundaries. We provide a detailed discussion of both the architectural and implementation considerations, and we provide an empirical evaluation that shows that indeed our prototype implementation scales with both the number(More)
People understand utterances in real time. Blank [1] described a natural language processor which also parses sentences in linear time. Like human performance, it stays within fixed and finite short-term memory—indeed, these limits prevent it from being overwhelmed by syntactic ambiguities. This paper reviews the parser and describes enhancements that allow(More)
The models are placed by modeling paradigm at the center of development process. These models are represented by languages, like UML the language standardized by the OMG which became necessary for development. Moreover the ontology engineering paradigm places ontologies at the center of development process, in this paradigm we find OWL the explicitation(More)