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(Summary of detailed comments from Sandy Gao) The distinction between axis and arc is unclear, and some statements are just wrong in the axis-view of the world, but not in the arc-view of the world; the appendix table talks about axes, but it is really listing arcs; The claim that the canonical path is the shortest isn't true in terms of axes; etc, etc.
The WG discussed this at the meeting 20100618 and agreed this was editorial in nature: the editor to fix it.
Clarification incorporated into latest draft.