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The visualization of ontologies and metadata is a challenging issue with several applications not only in the Semantic Web but also in Software Engineering, Database Design and Artificial Intelligence. This paper aims at identifying and analyzing the more principal aspects of this problem, surveying some of the work that has been done so far, and at proposing novel ideas that are worth further research and investigation. In particular, it describes the main factors that determine whether an ontology diagram layout is satisfying or not and focuses on the visualization requirements of large-sized ontology diagrams.