A ring is used to represent a single connected component of a surface boundary
as specified in ISO 19107:2003, 6.3.6. Every gml:curveMember references or contains one
curve, i.e. any element which is substitutable for gml:AbstractCurve. In the context of a
ring, the curves describe the boundary of the surface. The sequence of curves shall be
contiguous and connected in a cycle. If provided, the aggregationType attribute shall have
the value “sequence”.
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