Gund Fellows Serguei Krivov and Ferdinando Villa, along with Richard Williams and Xindong Wu wrote chapter chapter 10, On Visualization of Owl Ontologies in the book Semantic web: revolutionizing knowledge discovery in the life sciences edited by Christopher J. O. Baker, Kei-Hoi Cheung. This chapter covers some of the concepts involving the standard ontology language OWL, exploring ways to expand the language.