Abstract
Protégé is one of the most popular tools of the ontology visualization. The “Protégé” tools are being
applied for further development in various disciplines for better understanding of knowledge. These tools
commonly use four methods of ontology visualization, namely, indented list, node-link and tree,
zoomable, and focus+context. The purpose of this work is to present a study on application of these four
methods in the development of different kinds of protégé visualization tools and categorize their
characteristics and features so that it assists in method selection and promotes further future research in
the area of ontology visualization.
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