From Semantic Web Standards

GoNTogle: A Tool for Semantic Annotation and Search

Name of the tool: GoNTogle: A Tool for Semantic Annotation and Search
Home page: The GoNTogle framework
Date of latest release:
Programming language(s) that can be used with the tool: Java
Relevant semantic web technologies: RDF, RDFS, OWL, SPARQL
Categories: Tool, Tagging, Recommendation, Search Engine
See also: http://http://semanticweb.org/wiki/GoNTogle
Public mailing list:
Preferred project URI: http://web.imis.athena-innovation.gr/projects/gontogle/
DOAP reference:
Company or institution:

(Tool description last modified on 2013-09-29.)


GoNTogle, is a tool for document annotation and retrieval, built on top of Semantic Web and IR technologies. GoNTogle provides both manual and automatic ontology-based annotations facilities, supporting documents of several formats (doc, pdf, txt, rtf, odt, sxw, etc.). Annotation is based on standard Semantic Web technologies like, OWL and RDF/S. All annotations are stored in a centralized server, providing an collaborative environment. A learning method, exploiting textual information and user annotation history, is proposed to support the automatic annotation mechanism.

GoNTogle also provides three search types: i) Keyword-based search, ii) Semantic-based search and iii) Hybrid search, which combines the keyword-based and semantic-based ones. Finally, several advanced ontology-based searching facilities are provided, including the capability to expand or shrink the resulting list using ontology information, in order to help the user retrieve high quality results.

New: Web-based version


  • Web-based application (new)
  • Document semantic annotations
  • Viewing and annotating popular document types (ex. pdf, doc, txt, etc.) while maintaining their initial format
  • Automatic/Manual annotation
  • Annotate whole and/or part of the documents
  • Supports OWL, RDF/S ontologies
  • Share annotations over centralized ontology server
  • Search facilities : keyword-based , semantic-based and hybrid search
  • Advanced ontology-based search facilities


  • Bikakis N., Giannopoulos G., Dalamagas T., Sellis T.: "Integrating Keywords and Semantics on Document Annotation and Search". In Proc. of 9th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE 2010)
  • Giannopoulos G., Bikakis N., Dalamagas T., Sellis T.: "GoNTogle: A Tool for Semantic Annotation and Search" (Demo). In Proc. of 7th Extended Semantic Web Conference (ESWC 2010)