In the last few years ontologies have emerged in many fields as efficient knowledge representation. Some of the visualization tools that should ease ontology understanding and exploration, are sometimes too complex to be used by domain experts, or are too simple and do not support all necessary user tasks. We present a multiple view visualization tool, which enables users a good hierarchical and relations overview as well as observation from different viewpoints. The tool embeds hierarchical connected circle, indented tree and node-link diagram. Basic and advanced functionalities allow searching, location of interest, exploration and understanding, while well thought design enables intuitive usage.
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