A PATH model is a direct translation of a simple features-alike object to normal form. This is four tables with the three kinds of entities, "objects" (or "features"), "paths" (or "parts") and "vertices", and a table to link the one-to-many relation between paths and vertices.
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arguments passed to methods
In a data set with no parts touching their neighbours, the only normalization of the vertices will be the removal of the duplicated closing coordinate on any polygon ring, and on any self-intersecting case within a single path.
PATH()$path should always have columns
object_ path_ subobject ncoords_
a PATH model, with tables 'object', 'path', 'path_link_vertex' and 'vertex'
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