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IADIS International Conference WWW/Internet 2010ONTOMO: WEB SERVICE FOR ONTOLOGY BUILDING -EVALUATION OF ONTOLOGY RECOMMENDATIONUSING NAMED ENTITY EXTRACTIONTakahiro Kawamura, I Shin, Hiroyuki Nakagawa, Yasuyuki Tahara and Akihiko OhsugaGraduate School of Information Systems, University of Electro-Communications1-5-1 Chofugaoka, Chofu-shi, Tokyo 182-8585, JapanABSTRACTInternet services using ontology in its background are rapidly increasing in the web. Those are sort of "lighter" ontologiescompared with ontologies which have been used in design and diagnosis. So, this paper proposes ONTOMO that is anontology building service specialized for lightweight ontologies. ONTOMO is also designed not for ontology experts, butfor users and/or developers of public web services. Here, we focused on ease of use, no installation, cooperative workenvironment, and providing sample applications to help the users' ontology building. Especially, it has a function whichrecommends instances and properties which belong to a certain ontology class in order to help the users to register them.In the recommendation function, we developed our own Named Entity Extraction mechanism based on bootstrappingmethod. In this paper, after the ONTOMO overview, we present the instance and property recommendation withexperimental evaluations.KEYWORDSOntology, Named Entity Extraction, Web Service1. INTRODUCTIONRecently, web services using ontology has increased. Most of ontologies for those services are definitions ofmetadata, and have simpler structures in comparison with conventional ontologies for design and diagnosis.Faltings (2007) says that "is-a" relation makes up 80-90 % of all the relations in such lightweight ontologies.However, ontology building tools proposed and developed so far are mainly for ontology experts, and few ofthem are focusing on public developers and users of Internet services. Therefore, we have developedONTOMO, an ontology building service aiming at offering an environment in which those people are able toeasily make necessary ontologies for their purpose. So the main target of ONTOMO is the people who havelittle expertise about what are an ontology, its schema, organization, and technical terms. Or, the people whohave some knowledge about the ontology, but no experiment of ontology building are also its targets.ONTOMO has been trying to clear the following three hurdles that the target people may have in theconventional ontology tools, which has been retrieved from interviews to non-ontology developers andprogrammers around.1. Necessary tool preparation and its usage are unclear, because of rich technical terms and functions.2. It's hard to know what term should be input as classes, instances, and properties, because they havenever thought about things according to ontology own scheme.3. Difficult to register a large amount of the terms (this point are relatively common regardless of thenon-expert or not).To solve these problems, ONTOMO takes the following approaches.A. Easy preparation for introductionONTOMO has no installation of any tools, and can be used by web browsers.B. Improvement of usability (design of user interface)It uses the public words without the technical terms, and narrows the functions down to ones only forbrowse and edit the lightweight ontology. Also, it keeps visibility and operability even in the browser.101