CANONICALLY PARAMETERISED POLYLINE
Definition
An object is a <CANONICALLY PARAMETERISED POLYLINE> if and only if: it is a <POLYLINE>; it is a <PARAMETERISED CURVE>; it has the canonical parameterisation for a polyline as follows: λ(u) = Pi(i-u) + Pi+1(u+1-i), for 1 ≤ i ≤ n-1 and i-1 ≤ u ≤ i where: u is a real_number, with the range 0 < u < n-1; P1, P2, … Pn are the points of the polyline