XDtools is a plugin originally used in the NeOn Toolkit ontology editor. XDtools is used as a tool for the ontology engineer when designing new ontologies or to add new parts to existing ontologies. The XDtools plugin was partially ported to another ontology editor, Protégé. This thesis describes the implementation and design choices made during the work with porting the plugin. A description of the parts that have been ported can be found in the report. It also contains the result of the testing and user study made after the implementation. Conclusions of those results and proposed changes to the plugin are also found in the report.

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