| http://www.w3.org/ns/prov#value | - FIG. 2 is an illustration of the local coordinate system and geometrical relationship between three fixed points Pa, Pb and Pc relative to a movable point P, the three fixed points corresponding to points Pna, Pnb and Pnc and the movable point P corresponding to the points Pn of FIG. 1, where n=1, 2 or 3;
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