A <zone> element is used within a <surface> to identify a rectangular region of the surface.

The region which the <zone> covers is given by the bounding box attributes, and is expressed in the same coordinate space as that used by the parent <surface> element. If a <zone> and its parent <surface> have the same bounding box values, then the <zone> corresponds to the entire area described by the surface (Wittern et al. 2009, 290).

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