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ISBN: 978-972-8939-25-0 © 2010 IADISrealized operability of a desktop application using Flex. Also, Spring Graph realized visibility of the wholeontology and the details of the definitions. In terms of D. Keeping of motivation, we are trying to motivatethe user by providing sample applications and open web APIs, and for E. Support of collaboration work anexclusive access control of ontology DB enabled multiple developers to build an ontology at once. For thoseapproaches, however, there are some other ways like improvement of documents, innovative user interface,and point system to registration, etc. In the future, we will compare several ways and discuss their effectmeasurement.6. RELATED WORKSThis section shows comparisons with other ontology building tools and Named Entity Extraction methods.As the famous ontology building tools, we compare with Protégé, Hozo, and KiWi. Protégé (2010) is themost popular ontology editor mainly used by ontology researchers for more than ten years, and has severaladvanced features like inference. Also, it opens plug-in specification, and now has 72 plug-ins in its officialsite such as data import from RDB, term extractions by text mining, etc. Hozo (2010) is a tool which has aunique feature to handle Role concept. It also has a distributed development environment which can keepdata consistency by checking difference of ontologies edited by multiple users. However, those are theheavyweight ontology tools mainly for the ontology experts, thus different from ONTOMO in its target userand problems to be solved. In the future, we will consult them with their ontology visualization plug-in andmechanism to keep the consistency of data, and so forth.On the other hand, KiWi (Knowledge in A Wiki) (2010) focused on the lightweight ontology, andextended Wiki by semantic web technology. It enables the user to edit its content through the same interfaceas Wiki, so the user can register the instances and properties without any special knowledge of ontology. It'sa different way than ONTOMO, but for the same purpose in easy introduction for non-expert, improvementof usability, and collaborative work. In the future, ONTOMO would also like to take Wiki-based changehistory and difference management.They all do not have any recommendation function for the instances and the properties, so that we couldalso distinguish ONTOMO by this function. But, we next compare this function with DIPRE and Snowball,which are the famous Named Entity Extraction methods for structured documents. DIPRE (Brin 1998) is apioneer of the bootstrapping from the web pages. First, it prepares a list of pairs of an author name and abook title, and searches them by a search engine. Then, if it finds a regular expression like "URL, prefixstring, book title, middle string, author name, suffix string" from the result, it adds the pairs of the authorname and the book title which match the regular expression. Snowball (Agichtein 2000) is an extension ofDIPRE, and tried to extract named entities in comparison with the string pairs of DIPRE. In contrast, we triedto extract the terms (instance, property) which belong to a certain set, and has a feature that the adaptationfilter eliminates the irrelevant terms using the hierarchical structure of the ontology, in addition to setting thethreshold to the number of patterns based on the experiment, and so forth. In the future, we consider anyperformance evaluation with the above-mentioned Google Sets and SEAL managing to make the samecondition for them.7. CONCLUSIONThis paper presented development of an ontology building service, ONTOMO. In addition to the abovefuture issues, we will consider an automated construction of ontology itself in the future. Web pages whichhave relatively high credibility of its content like Wikipedia would be a good source of the ontology. Thereare already some researches to build the ontology from part of Wikipedia content, but a point in the futurewould be how we merge the information from a variety of sources accurately. We will continue to offer theontology tool for the public developers and users of the Internet services incorporating a diverse range oftheir opinions.110