| http://www.w3.org/ns/prov#value | - For example, if the polygon is a triangle as shown in FIG. 1, information (x,y,z,I) containing three-dimensional coordinate values and a intensity value about a vertex A is (x1,y1,z1,I1), that about a vertex B is (x2,y2,z2,I2), and that about a vertex C is (x3,y3,z3,I3).
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