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ONKI Ontology and Thesaurus API

The service compiles concept ontologies, vocabularies, and thesauri from Finnish and international sources to aid cost-effective publishing on the Semantic Web. Such reference resources enable implementation of conceptual models and verbal taxonomies within a domain. Machine-processable statements of relations between concepts allow applications to present data from multiple sources in appropriate semantic context for user understanding.

API methods support retrieval of ontology listings matching a search query term, providing a hierarchy of concepts including the term and others related semantically to it. Methods allow retrieval of related terms, terms with similar but narrower meaning, terms with similar but broader meaning, and groups of interrelated terms.

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ONKI Ontology and Thesaurus: Highlights

Finnish library thesaurus and ontology service
Data Formats
API home

ONKI Ontology and Thesaurus: Specifications


Client Install Required
Service Endpoint
http://onki.fi/key-{YOUR ONKI KEY}/api/v2/htt ...
http://onki.fi/api/v1/soap/wsdl/?o=yso&k={ONK ...

Signup and Licensing

Signup Requirements
Developer Key Required
Account Required
Commercial Licensing
Non-Commercial Lic.
Data Licensing
Usage Fees
Program Fees
Certification Program
Usage Limits
Terms of Service


Authentication Model
API Key 
SSL Support
Read-only Without Login


Vendor API Kits
Community API Kits
API Blog
Site Blog
API Forum
Developer Support
Console URL

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