| http://www.w3.org/ns/prov#value | - he other hand,a point that is absent OFF the surface is NEVER visible.)We shall have many future occasions to refer to the presence or absence of a vertex, or to whether it is ON or OFF the surface In the same way it will be convenient to refer to polygons and entire patches as either present or absent, ON or OFF. Polygons and patches do not have individual ON flags of their own; their presence or
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