Purely visual language semantics have been derived entirely or predominantly from graphical rules. These languages are usually characterized by heavy reliance on visual techniques throughout the programming process. The program created in purely visual language is compiled directly from its visual representation and not translated into any text-based language. Examples of these languages include Pictorial Janus, VIPR, Prograph and PICT. There are other suggestion to subdivide this category into more specific language paradigm such as object-oriented, functional, imperative and logic. Burnett and Baker [5] have developed a classification scheme for classifying VPL research papers. Their aim is to help other researchers to easily locate relevant works in this field.