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Finnish Ontology Library Service ONKI

The Finnish Ontology Library Service ONKI is a pilot version of a national, centralized ontology library and related ontology services. The system was created as a part of the National Semantic Web Ontology Project in Finland (FinnONTO 2003-2007) and FinnONTO 2.0 projects by the SeCo group.

ONKI Ontology Library Server

ONKI screenshot

The core component of the ONKI service is its Ontology Library Server ONKI. It constitutes an important component of the Finnish semantic web infrastructure developed in the FinnONTO projects.

There are three versions of the ONKI server available:

  • ONKI SKOS for lightweight vocabularies in SKOS and ontologies in RDFS/OWL format
  • ONKI Geo for geo-ontologies with map support
  • ONKI People for representing people and organizations (and similar datasets of individuals)

The Finnish Ontology Library Service ONKI is targeted for three user groups:

  1. For an ontology developer, ONKI provides the collaborative ontology development and versioning environment.
  2. For a content indexer, ONKI provides a web-based browser (called ONKI browser) for finding desired concepts and for transporting the corresponding URI or other data from the ONKI server into an external application.
  3. For an information searcher, ONKI browser can be used for finding and disambiguating keyword meanings, and for transporting the corresponding URIs into search engines and other applications. For example, by typing in "bank" the browser finds the different meanings of the word and shows them to the user.

Integrating ONKI servers to indexing systems using the mash-up approach

The ONKI server can be integrated easily and cost-efficiently to existing content management systems (CMS) and other indexing applications using the mash-up approach, which has been demonstrated in the ONKI annotation demo. The instructions on how to integrate the ONKI server to indexing systems can be found on the ONKI Selector Generator page. See also publications below for more information.

Demonstration Applications

Selected installations of ONKI can be found below for testing:

See Finnish Ontology Library Service ONKI for a variety of ontologies and related services available on the web.

Contact the ONKI Team

Descriptions of ontologies developed at SeCo can be found here.

Articles

2009

Jouni Tuominen, Matias Frosterus, Kim Viljanen and Eero Hyvönen: ONKI SKOS Server for Publishing and Utilizing SKOS Vocabularies and Ontologies as Services. Proceedings of the 6th European Semantic Web Conference (ESWC 2009), Heraklion, Greece, May 31 - June 4, 2009. Springer-Verlag. bib pdf
Vocabularies are the building blocks of the Semantic Web providing shared terminological resources for content indexing, informa- tion retrieval, data exchange, and content integration. Most semantic web applications in practical use are based on lightweight ontologies and, more recently, on the Simple Knowledge Organization System (SKOS) data model being standardized by W3C. Easy and cost-efficient publi- cation, integration, and utilization methods of vocabulary services are therefore highly important for the proliferation of the Semantic Web. This paper presents the ONKI SKOS Server for these tasks. Using ONKI SKOS, a SKOS vocabulary or a lightweight ontology can be published on the web as ready-to-use services in a matter of minutes. The services include not only a browser for human usage, but also Web Service and AJAX interfaces for concept finding, selecting and transporting resources from the ONKI SKOS Server to connected systems. Code generation ser- vices for AJAX and Web Service APIs are provided automatically, too. ONKI SKOS services are also used for semantic query expansion in in- formation retrieval tasks. The idea of publishing ontologies as services is analogous to Google Maps. In our case, however, vocabulary services are provided and mashed-up in applications. ONKI SKOS was published in the beginning of 2008 and is to our knowledge the first generic SKOS server of its kind. The system has been used to publish and utilize some 60 vocabularies and ontologies in the National Finnish Ontology Service ONKI www.yso.fi.
Kim Viljanen, Jouni Tuominen and Eero Hyvönen: Ontology Libraries for Production Use: The Finnish Ontology Library Service ONKI. Proceedings of the 6th European Semantic Web Conference (ESWC 2009), Heraklion, Greece, May 31 - June 4, 2009. Springer-Verlag. bib pdf
This paper discusses problems of creating and using ontology library services in production use. One approach to a solution is presented with an online implementation--the Finnish Ontology Library Service ONKI--that is in pilot use on a national level in Finland. ONKI contributes to previous research on ontology libraries in many ways: First, mashup and web service support with various tools is provided for cost-efficient utilization of ontologies in indexing and search applications. Second, services covering the different phases of the ontology life cycle are provided. Third, the services are provided and used in real world applications on a national scale. Fourth, the ontology framework is being developed by a collaborative effort by organizations representing different application domains, such as health, culture, and business.
Eero Hyvönen, Eetu Mäkelä, Tomi Kauppinen, Olli Alm, Jussi Kurki, Tuukka Ruotsalo, Katri Seppälä, Joeli Takala, Kimmo Puputti, Heini Kuittinen, Kim Viljanen, Jouni Tuominen, Tuomas Palonen, Matias Frosterus, Reetta Sinkkilä, Panu Paakkarinen, Joonas Laitio, Katariina Nyberg: CultureSampo - A National Publication System of Cultural Heritage on the Semantic Web 2.0. Proceedings of the 6th European Semantic Web Conference (ESWC2009), Heraklion, Greece, May 31 - June 4, 2009. Springer-Verlag. bib pdf
Jouni Tuominen, Tomi Kauppinen, Kim Viljanen and Eero Hyvönen: Ontology-Based Query Expansion Widget for Information Retrieval. Proceedings of the 5th Workshop on Scripting and Development for the Semantic Web (SFSW 2009), 6th European Semantic Web Conference (ESWC 2009), Heraklion, Greece, May 31 - June 4, 2009. bib pdf
In this paper we present an ontology-based query expansion widget which utilizes the ontologies published in the ONKI Ontology Service. The widget can be integrated into a web page, e.g. a search system of a museum catalogue, enhancing the page by providing a query expansion functionality. We have tested the system with general, domain-specific and spatio-temporal ontologies.
Eero Hyvönen, Eetu Mäkelä, Tomi Kauppinen, Olli Alm, Jussi Kurki, Tuukka Ruotsalo, Katri Seppälä, Joeli Takala, Kimmo Puputti, Heini Kuittinen, Kim Viljanen, Jouni Tuominen, Tuomas Palonen, Matias Frosterus, Reetta Sinkkilä, Panu Paakkarinen, Joonas Laitio, Katariina Nyberg: CultureSampo - Finnish Culture on the Semantic Web 2.0. Thematic Perspectives for the End-user. Proceedings, Museums and the Web 2009, Indianapolis, USA, April 15-18, 2009. bib pdf
Lynda Hardman, Jacco van Ossenbruggen, Lora Aroy and Eero Hyvönen: Using AI to Access and Experience Cultural Heritage. IEEE Intelligent Systems, vol. 24, no. 2, IEEE Computer Society, March/April, 2009. bib pdf
Eero Hyvönen, Eetu Mäkelä, Tomi Kauppinen, Olli Alm, Jussi Kurki, Tuukka Ruotsalo, Katri Seppälä, Joeli Takala, Kimmo Puputti, Heini Kuittinen, Kim Viljanen, Jouni Tuominen, Tuomas Palonen, Matias Frosterus, Reetta Sinkkilä, Panu Paakkarinen, Joonas Laitio, Katariina Nyberg: CultureSampo - Finnish Cultural Heritage Collections on the Semantic Web 2.0. Proceedings of the 1st International Symposium on Digital Humanities for Japanese Arts and Cultures (DH-JAC-2009), Ritsumeikan University, Kyoto, Japan, March, 2009. bib pdf
Tomi Kauppinen, Heini Kuittinen, Jouni Tuominen, Katri Seppälä and Eero Hyvönen: Extending an Ontology by Analyzing Annotation Co-occurrences in a Semantic Cultural Heritage Portal. Proceedings of the ASWC 2008 Workshop on Collective Intelligence (ASWC-CI 2008) organized as a part of the 3rd Asian Semantic Web Conference (ASWC 2008), Bangkok, Thailand, February 2-5, 2009. bib pdf
Ontologies aim to capture knowledge about things and their relationships. Publishing ontologies on the Semantic Web enables people and organizations to use shared ontologies in annotating e.g. photographs, videos, music, and other types of cultural objects. Search engines also use relationships provided by ontologies in semantic search, e.g. for query expansion or for view-based search. However, building ontologies is a time-consuming process, and it should be helped by automatic finding of interesting, possible relationships. Finding the correct concept for annotation purposes is helped by subsumption and partonomy hierarchies and associative relationships. In this paper we show how an analysis of co-occurrences of concepts in annotations can be used to provide interesting relationships for enriching ontological structures. We use association rule mining techniques and test the idea using a set of annotations of cultural objects in CULTURESAMPO portal and the Finnish General Upper Ontology YSO. The results are visualized in the ONKI SKOS browser to give an additional layer on top of the original relationships of the YSO ontology. An analysis shows that best ranked relationships should also be included in the ontology as subclassof or associative relationships.

2008

Eero Hyvönen: Semanttinen web ja paikkatietoihin perustuvat palvelut (Semantic web and services based on geographical data. Historiaa kunnioittaen, tulevaisuuteen suunnaten. Maanmittaustieteen päivät 2008, Maanmittaustieteiden Seura, julkaisu n:o 45, ss. 8-16, Espoo, Finland, Nov, 2008. bib pdf
Artikkelissa luodaan katsaus kansallisessa Suomalaiset semanttisen webin ontologiat hankkeessa FinnONTO 2003-2007 ja FinnONTO 2.0 2008-2010 kehitettyihin paikkaontologioihin SUO (Suomalainen paikkaontologia) ja SAPO (Suomen ajallinen paikkaontologia), näiden julkaisemiseen AJAX-palveluina Kansallisessa ontologiapalvelussa ONKI, sekä paikkaontologioiden avulla Kulttuurisampo-portaaliin kehitettyihin palveluhin.
Eero Hyvönen, Kim Viljanen, Jouni Tuominen, Katri Seppälä, Tomi Kauppinen, Matias Frosterus, Reetta Sinkkilä, Jussi Kurki, Olli Alm, Eetu Mäkelä and Joonas Laitio: National Ontology Infrastructure Service ONKI. Oct 1, 2008. bib pdf
This paper presents the national level cross-domain ontology and ontology service infrastructure ONKI used in Finland. The novelty of ONKI is based on two ideas. First, the core ontologies are developed collaboratively by experts transforming thesauri into mutually aligned lightweight ontologies, based on a large top ontology that is extended by various domain specific ontologies. Second, the National Ontology Service ONKI has been implemented for publishing ontologies cost-efficiently as ready to use services. ONKI provides legacy and other applications with ready to use functionalities for using ontologies on the HTML level by Ajax and semantic widgets. ONKI has been used in various applications for creating mash-up applications in a way analogous to using Google Maps, but in our case external applications are mashed-up with ontology support for indexing and information retrieval.
Osma Suominen, Eero Hyvönen, Kim Viljanen, Eija Hukka: HealthFinland - A National Publication System for Semantic Health Information. Semantic Computing Research Group, Helsinki University of Technology and University of Helsinki, Sept 29, 2008. bib pdf
Eero Hyvönen, Eetu Mäkelä, Tomi Kauppinen, Olli Alm, Jussi Kurki, Tuukka Ruotsalo, Katri Seppälä Kim Viljanen, Jouni Tuominen, Tuomas Palonen, Matias Frosterus, Reetta Sinkkilä, Panu Paakkarinen, Joonas Laitio, Katariina Nyberg: CultureSampo - A Collective Memory of Finnish Cultural Heritage on the Semantic Web 2.0. Semantic Computing Research Group, Helsinki University of Technology and University of Helsinki, Sept 29, 2008. bib pdf
Eero Hyvönen: Kulttuurisampo - suomalainen kulttuuri semanttisessa webissä. Muistiorganisaatioiden ja kansalaisten yhteisöllinen kansallinen julkaisujärjestelmä (CultureSampo - Finnish culture on the Semantic Web. A national collaborative Semantic Web 2.0 portal for memory organizations and citizens.). Paper presented at the publication event of the CultureSampo portal, National Museum, Helsinki, Finland, Sept 25, 2008. bib pdf
Eero Hyvönen: FinnONTO-malli kansallisen semanttisen webin sisältöinfrastruktuurin perustaksi - visio ja sen toteus (FinnONTO model as the basis for a national semantic web infrastructure - vision and its implementation). Paper presented at the publication event of the Finnish Ontology Library Service ONKI, Espoo, Finland, Sept 12, 2008. bib pdf
Jouni Tuominen, Matias Frosterus, Kim Viljanen and Eero Hyvönen: ONKI-SKOS - Publishing and Utilizing Thesauri in the Semantic Web. AI and Machine Consciousness - Proceedings of the 13th Finnish Artificial Intelligence Conference STeP 2008, Espoo, Finland, August 20-22, 2008. bib pdf
Thesauri and other controlled vocabularies act as building blocks of the Semantic Web by providing shared terminology for facilitating information retrieval, data exchange and integration. Representation and publishing methods are needed for utilizing thesauri efficiently, e.g., in content indexing and searching. W3C has provided the Simple Knowledge Organization System (SKOS) data model for expressing concept schemes, such as thesauri. A standard representation format for thesauri eliminates the need for implementing thesaurus specific rules or applications for processing them. However, there do not exist general tools which provide out of the box support for publishing and utilizing SKOS vocabularies in applications, without needing to implement application specific user interfaces for end users. For solving this problem the ONKI-SKOS server is presented.
Jussi Kurki: Finding People and Organizations on the Semantic Web. AI and Machine Consciousness - Proceedings of the 13th Finnish Artificial Intelligence Conference STeP 2008, Espoo, Finland, August 20-22, 2008. bib pdf
Finding people is essential in finding information. Librarians and information scientists have studied authority control - psychologists and sociologists social networks. In aforementioned, authors link to documents (and co-authors) creating access points to information. In latter, social paths serve as channels for rumours as well as expertise. Key problems include identification and disambiguation of individuals followed by difficulties of tracking the social connections. With semantic web, these aspects can be approached simultaneously. In this paper, we define a simple ontology for describing people and organizations. The model is based on FOAF and other existing vocabularies. We also demonstrate search and visualization tools for finding people.
Tomi Kauppinen, Riikka Henriksson, Reetta Sinkkilä, Robin Lindroos, Jari Väätäinen and Eero Hyvönen: Ontology-based Disambiguation of Spatiotemporal Locations. Proceedings of the 1st international workshop on Identity and Reference on the Semantic Web (IRSW2008), 5th European Semantic Web Conference 2008 (ESWC 2008), CEUR Workshop Proceedings, ISSN 1613-0073, June 1-5, 2008. bib pdf
Geographic place names are semantically often highly ambiguous. For example, there are 491 places in Finland sharing the same name ”Isosaari” (great island) that are instances of several geographical classes, such as Island, Forest, Peninsula, Inhabited area, etc. Referencing unambiguously to a particular ”Isosaari”, either when annotating content or during information retrieval, can be quite problematic and requires usage of advanced search methods and maps for semantic disambiguation. Historical places introduce even more challenges, since historical metadata commonly make spatiotemporal references to historical regions and places using names whose meanings are non-existing or different in different times. This paper presents how these problems have been addressed in a large Finnish place ontology SUO and a historical geo-ontology SAPO. A location ontology server ONKI-Geo has been created for publishing the ontologies and utilizing them as mashup services. To demonstrate the usability of our ontologies, two case applications in the cultural heritage domain are presented.
Kim Viljanen, Jouni Tuominen and Eero Hyvönen: Publishing and Using Ontologies as Mash-Up Services. Proceedings of the 4th Workshop on Scripting for the Semantic Web (SFSW2008), 5th European Semantic Web Conference 2008 (ESWC 2008), Tenerife, Spain, June 1-5, 2008. bib pdf
The Semantic Web is based on using ontologies for enabling semantically disambiguated data exchange between distributed systems on the web. This requires efficient means for publishing ontologies on the web to ensure the availability, sharing and acceptance of the ontologies. Support services are needed for utilizing ontologies easily and cost-effectively in applications and legacy systems lacking ontology support. To address these vital needs, this paper presents the ONKI ontology service which provides ready-to-use mash-up functionalities, such as semantic disambiguation, concept finding and concept fetching as ready-to-use web widgets for adding ontology support to e.g. HTML forms using JavaScript. Two implementations of the ONKI Server are presented: ONKI-SKOS for ontologies presented in the Simple Knowledge Organization System (SKOS) language and ONKI-Geo for geographical ontologies with a map interface. The presented ONKI systems are operational on the web, used in the National Finnish Ontology Service. They have been successfully used in several pilot applications.
Eero Hyvönen, Kim Viljanen, Jouni Tuominen and Katri Seppälä: Building a National Semantic Web Ontology and Ontology Service Infrastructure--The FinnONTO Approach. Proceedings of the European Semantic Web Conference ESWC 2008, Springer, Tenerife, Spain, June 1-5, 2008. bib pdf
This article presents the vision and results of creating a national level cross-domain ontology service infrastructure in Finland in the FinnONTO project. The novelty of the infrastructure is based on two ideas. First, a system of open source core ontologies is being developed by transforming thesauri into mutually aligned lightweight ontologies, including a top ontology of 20,000 concepts that is extended by various domain specific ontologies. Second, the ONKI Ontology Server framework for publishing ontologies as ready to use services has been designed and implemented. ONKI provides legacy and other applications with ready to use functionalities for using ontologies on the user interface level as semantic widgets. The idea is to use ONKI for creating mash-up applications in a way analogous to using Google or Yahoo Maps, but in our case external applications are mashed-up with ontology support. The ontology framework presented is operational on the web and is being used in creating the application demonstrations.
Eero Hyvönen, Kim Viljanen, Osma Suominen, Eija Hukka: HealthFinland - Publishing Health Promotion Information on the Semantic Web. Proceedings of DrMED 2008: International Workshop on Describing Medical Web Resources. The 21st International Congress on the European Federation for Medical Informatics (MIE 2008), Göteborg, Sweden, May, 2008. bib pdf
Robin Lindroos: Paikkatiedon ontologiapalvelu. MSc Thesis, May, 2008. bib pdf
Tämä diplomityö käsittelee menetelmiä, joilla paikkatietoaineistoja muunnetaan ontologiseen muotoon sekä esittelee palvelun, ONKI-Paikan, jolla ontologisessa muodossa olevaa paikkatietoa voidaan tuottaa, ylläpitää ja hakea. Palvelu perustuu paikkatiedon mallintamiseen Suomalaisen paikkaontologian SUO:n mukaisesti. Työ koostuu neljästä vaiheesta. Ensimmäisessä vaiheessa selvitetään menetelmä, jolla SUO-ontologia populoidaan paikkainstansseilla. Erityistä huomiota kiinnitetään paikkojen uniikkien tunnisteiden, URI:en luomiseen. Toisessa vaiheessa selvitetään, miten ontologian populointivaiheessa tuotetut paikkojen RDF-kuvaukset on tallennettava. Kolmannessa vaiheessa ratkotaan ontologisessa muodossa olevan paikkatietoaineiston suuren määrän tuomia ongelmia muun muassa kehittämällä paikkatiedon RDF-varastolle indeksointitietokanta nopeita hakuja varten. Neljännessä vaiheessa kehitetään rajapinta hakujen suorittamista varten sekä hakurajapintaa hyödyntävä graafinen, selaimessa toimiva käyttöliittymä. Työ on tehty osana FinnONTO-projektia, jossa kehitettiin suomalaisiin olosuhteisiin räätälöityjä semanttisen webin ontologioita sekä näitä hyödyntäviä palveluita.
Riikka Henriksson, Tomi Kauppinen and Eero Hyvönen: Core Geographical Concepts: Case Finnish Geo-Ontology. Location and the Web (LocWeb) 2008 workshop, 17th International World Wide Web Conference WWW 2008, ACM International Conference Proceeding Series; Vol. 300, Pages 57-60, Beijing, China, April 21-25, 2008. bib pdf
In this paper we examine 1) the scope of geo-ontologies used especially for the purposes of information retrieval on the Web, 2) the core geographical concepts and their mutual relations, and 3) the properties the concepts have. Furthermore, we present the Finnish geo-ontology (Suomalainen paikkaontologia, SUO) and discuss the theories and principles that have governed the development process, as well as the limitations and requirements the use of geographical dictionaries as an instance data source have imposed to the content and the structure of SUO.
Kim Viljanen, Jouni Tuominen, Teppo Känsälä and Eero Hyvönen: Distributed Semantic Content Creation and Publication for Cultural Heritage Legacy Systems. Proceedings of the 2008 IEEE International Conference on Distributed Human-Machine Systems, IEEE Press, Athens, Greece, March 9-12, 2008. bib pdf
Cultural heritage is by nature strongly interlinked, e.g. thematically and historically, but at the same time distributed in heterogeneous collections of different memory organizations at different locations. In order to provide the end-users with aggregated homogeneous views to distributed heterogeneous contents, semantic portals have been created successfully based on metadata and shared (or aligned) ontologies. This paper discusses two problems encountered in such a distributed semantic content creation environment. First, during the content creation work, how could a publisher start using shared ontologies in legacy cataloguing and annotation systems that do not support ontologies. Second, during content publication, how could a publisher re-use the aggregated content in its own legacy publication system, e.g., on the ordinary web pages of a museum or in a collection browser. As a solution, we present the ONKI Ontology Server for adding shared ontological annotation functionalities to legacy cataloguing systems in a practical, cost-efficient and lightweight way. For distributed publishing of the aggregated semantic portal services, we introduce the lightweight mash-up web widget components called floatlets . A major idea behind both the ONKI functionalities and floatlets is that they can be easily integrated with legacy systems on the user interface level, in the same spirit as e.g. Google Maps.

2007

Eetu Mäkelä, Kim Viljanen, Olli Alm, Jouni Tuominen, Onni Valkeapää, Tomi Kauppinen, Jussi Kurki, Reetta Sinkkilä, Teppo Känsälä, Robin Lindroos, Osma Suominen, Tuukka Ruotsalo and Eero Hyvönen: Enabling the Semantic Web with Ready-to-Use Web Widgets. Proceedings of the First Industrial Results of Semantic Technologies Workshop, ISWC2007, November 11, 2007. bib pdf
A lot of functionality is needed when an application, such as a museum cataloguing system, is extended with semantic capabilities, for example ontological indexing functionality or multi-facet search. To avoid duplicate work and to enable easy and cost-efficient integration of information systems with the Semantic Web, we propose a web widget approach. Here, data sources are combined with functionality into readyto-use software components that allow adding semantic functionality to systems with just a few lines of code. As a proof of the concept, we present a collection of general semantic web widgets and case applications that use them, such as the ontology server ONKI, the annotation editor SAHA and the culture portal CultureSampo.
Kim Viljanen, Jouni Tuominen, Eero Hyvönen, Eetu Mäkelä and Osma Suominen: Extending Content Management Systems with Ontological Annotation Capabilities. Poster proceedings of the 6th International Semantic Web Conference, Busan, Korea, November 11-15, 2007. bib pdf
Producing semantic metadata requires efficient methods, e.g., concept finding, for accessing and using ontologies. To add such functionalities to metadata applications such as cataloging systems in museums, we propose a \emphmash-up approach where ready-to-use user interface components for using specific ontologies are made available to be integrated into applications. As a proof-of-concept, we present the \emphOntology Service ONKI wich implements semantic autocompletion concept search and concept browsing for ontologies as shared mash-up components.
Eero Hyvönen, Kim Viljanen and Osma Suominen: HealthFinland - Finnish Health Information on the Semantic Web. Proceedings of the 6th International Semantic Web Conference (ISWC 2007), Busan , Korea, Springer-Verlag, Nov, 2007. bib pdf
This paper shows how semantic web techniques can be applied to solving problems of distributed content creation, discovery, linking, aggregation, and reuse in health information portals, both from end-users and content publishers viewpoints. As a case study, the national semantic health portal \HF\ is presented. It provides citizens with intelligent searching and browsing services to reliable and up-to-date health information created by various health organizations in Finland. The system is based on a shared semantic metadata schema, ontologies, and ontology services. The content includes metadata about thousands of web documents such as web pages, articles, reports, campaign information, news, services, and other information related to health.
Eero Hyvönen, Robin Lindroos, Tomi Kauppinen and Riikka Henriksson: An ontology service for geographical content. Poster Proceedings of the International Semantic Web Conference (ISWC 2007), Busan, Korea, Nov, 2007. bib pdf
Geographic place names are widely used but are semantically often highly ambiguous. For example, there are 491 places in Finland sharing the same name Isosaari (great island) that are instances of several geographical classes, such as Island, Forest, Peninsula, Inhabited area, etc. Referencing unambiguously to a particular Isosaari , either when annotating content or during information retrieval, can be quite problematic and requires usage of advanced search methods and maps for semantic disambiguation. This paper presents an ontology server, ONKI-Paikka, for solving the place finding and place name disambiguation problem. In ONKI-Paikka, places can be found by a faceted search engine, combined with semantic autocompletion and a map service for constraining search and for visualizing results. The service can be connected to legacy applications cost-effectively by using Ajax-technology in the same spirit as Google Maps that is used in ONKI-Paikka as a subservice.
Kim Viljanen, Jouni Tuominen and Eero Hyvönen: ONKI Ontology Server--Extending Legacy Systems with Ontology Mash-up Services. November, 2007. Submitted for review. bib pdf
The Semantic Web is based on using shared ontologies for enabling semantically disambiguated data exchange between distributed systems on the web. This requires, from the ontology publisher s viewpoint, efficient means for publishing ontologies on the web to ensure the availability and acceptance of the ontologies. From the ontology user s viewpoint, support services are needed for utilizing ontologies easily and cost-effectively in the users own systems that are typically legacy systems without ontology support. This paper presents the ONKI ontology server for addressing these vital needs. For the publisher, ONKI provides a server and a Simple Knowledge Organization (SKOS) compatible light-weight ontology browser with ready-made web interfaces for making ontologies available both for human and machine users. For external legacy and other applications, ONKI provides centralized ontology services for semantic disambiguation, concept finding, and concept fetching. A major contribution of ONKI is to provide these services as ready-to-use functionalities for creating mash-up applications very cost-efficiently. Two prototypes of the system---ONKI-SKOS for all kinds of ontologies and ONKI-Geo for geographical ontologies with a map mash-up interface---are operational on the web and are currently being successfully used in several pilot applications.
Eero Hyvönen, Kim Viljanen, Eetu Mäkelä, Tomi Kauppinen, Tuukka Ruotsalo, Onni Valkeapää, Katri Seppälä, Osma Suominen, Olli Alm, Robin Lindroos, Teppo Känsälä, Riikka Henriksson, Matias Frosterus, Jouni Tuominen, Reetta Sinkkilä and Jussi Kurki: Elements of a National Semantic Web Infrastructure - Case Study Finland on the Semantic Web (Invited paper). Proceedings of the First International Semantic Computing Conference (IEEE ICSC 2007), Irvine, California, September, 2007. IEEE Press. bib pdf
This article presents the vision and results of creating the basis for a national semantic web content infrastructure in Finland in 2003-2007. The main elements of the infrastructure are shared and open metadata schemas, core ontologies, and public ontology services. Several practical applications testing and demonstrating the usefulness of the infrastructure are overviewed in the fields of eCulture, eHealth, eGovernment, eLearning, and eCommerce.
Kim Viljanen, Eero Hyvönen, Eetu Mäkelä, Osma Suominen and Jouni Tuominen: Mash-up Ontology Services for the Semantic Web. Demo track at the European Semantic Web Conference ESWC 2007, Innsbruck, Austria, June 4-5, 2007. bib pdf
We present ONKI ontology server, a mash-up approach for integrating ontology library services with semantic web applications. The idea of ONKI is to provide applications with ready-to-use ontology service functionalities, such as semantic autocompletion, browsing, and annotation support, at the user interface level using AJAX mash-up technologies. The system is being integrated with various semantic web applications.
Robin Lindroos, Tomi Kauppinen, Riikka Henriksson and Eero Hyvönen: ONKI-Paikka: An Ontology Service for Geographical Data. Helsinki, Apr, 2007. bib pdf
Ville Komulainen: Public Services for Ontology Library Systems. MSc Thesis, January, 2007. bib pdf

2005

Ville Komulainen, Arttu Valo and Eero Hyvönen: A Tool for Collaborative Ontology Development for the Semantic Web. Proceedings of International Conference on Dublin Core and Metadata Applications (DC 2005), Nov, 2005. bib pdf
Ville Komulainen, Arttu Valo and Eero Hyvönen: A Collaborative Ontology Development and Service Framework ONKI. Proceeding of ESWC 2005, poster papers, 2005. bib pdf

in Finnish:

ONKI - Kansallinen ontologiakirjastopalvelin

Täkeimpänä ontologiapalveluiden kehityskohteena FinnONTO-projektissa on kansallinen ontologiakirjasto ja -palvelin ONKI. ONKI tarjoaa palveluja kolmelle käyttäjäryhmälle:

  1. Ontologian kehittäjät saavat työvälineen hajautetun ontologiakehityksen koordinoimiseksi ja tueksi. Järjestelmän avulla eri sanastoja kehittävät työryhmät voivat ottaa käyttöönsä toistensa määrittelemiä käsitteitä, hallita ontologioiden versiointia, pysyä ajan tasalla toisten ontologioiden muutoksista jne.
  2. Tiedon indeksoijalle on tarjolla selainperustainen web-palvelu, jolla sisällönkuvailussa tarvittava käsite voidaan vaivattomasti löytää ja siirtää web-palvelun kautta ulkoiseen sovellukseen, esimerkiksi museon luettelointijärjestelmään.
  3. Tiedon hakijalle on tarjolla edellisen kaltainen selainperustainen palvelu, jolla voidaan helposti muodostaa ontologiaperustaisia kyselyjä. Näin voidaan esimerkiksi erottaa hakusanan "Nokia" merkitys yrityksenä ja kuntana tai se, onko "johtamisessa" kyse yrityksen, sähkön, kaavan, vai musiikin johtamisesta. Edelleen voidaan löytää johtamista käsittelevät dokumentit (web-sivut), vaikka niissä puhuttaisiin johtamisesta eri sanoin tai eri kielillä.

(Katso demo-sovellus.)

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