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A new UNL Explorer has been developed and is provided at www.undl.org/unlexp/ and www.unl.undl.org/unlexp/ by the UNL Center.

The UNL Explorer is a UNL-based Multilingual Intelligent Information and Knowledge Management System.

The UNL Explorer provides users with an integrated environment that users can search for and edit knowledge and information based on UNL.

Using the UNL Explorer, search for information of UNL Encyclopedia can be made by content, keyword or keyconcept search, or though navigation of the UW System of the UNL Ontology

The UNL Explorer has the following characteristics:

Semantic Co-occurrence Relation Search

whether a relation between two UWs is true or not, what UWs can have a relation with another UW, or what relations are possible between two UWs can be verified based on the UNL Ontology.

UNL-based Semantic Network Search

Content search is carried out based on UNL Expressions.

Intensional Definition-based Inference

every UW is given an intentional definition to specify its all the essential properties. the definition is used in inference about all concepts it related.

Multilingual Information Processability

the UNL Explorer allows users to search for information described in whatever language using their native languages, or to provide or edit information using their native languages.

UNL Graphical Editability

A graphical editor of UNL Expressions works together with the UNL Explorer.

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UNL Center

Meiying ZHU ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it )

Katsuhide SAKAI ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it ), Network Administrator
Gunarso ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it ) , Technical Advisor


  1. The UNL Center shall have the overall responsibility for promoting and coordinating the UNLP and, in particular, the development and maintenance of the UNL system. This shall include, among other functions, fostering the technical performance of the UNL system and setting up an infrastructure to make it operational.
  2. Specifically, to fostering the technical performance the UNL Center shall:
    1. Develop, maintain and enhance the components of the UNL system and ensure its technical operability;
    2. Provide the set of UNL system documents and tools to the various UNLP members and partners, manage its use, and provide technical assistance and training;
    3. Programme and plan subjects of research and development of common interest for the improvement of the UNL system and conclude contracts for research and training activities;
    4. Promote exchanges of scholarly, scientific and technical ideas and information within and outside the UNLP community.
  3. To set up an operational infra-structure, the UNL Center shall:
    1. Promote the UNLP network, create and coordinate the work of the LCs, NUs, PTC and Working Groups, and incorporate the work of other partners associated with UNLP;
    2. The UNL Center shall also direct and co-ordinate the research on languages not covered by any LC;
    3. Serve as depository of information regarding the expertise available on subjects of relevance to the work of the UNLP and maintain an up-to-date roster of qualified scholars in the field of research of Natural Language, Linguistics and Computer Science, and assist UNL Language Centers in finding competent scholars as necessary;


The UNL Center (UNLC) is located in Tokyo. For details please see address of UNL Center.