The BONDABLE_RING_AREA section is used to describe metal on the top layer that is exposed by the solder mask. The UPD software (Sigrity) generates this data.
[BONDABLE_RING_AREA] LAYER_NAME NET_NAME NUMBER_OF_POLYS WIDTH_OF_EDGE NUM_OF_VERTICES X,Y X,Y X,Y NUM_OF_VERTICES X,Y X,Y X,Y
LAYER_NAME - each ring entity must be assigned to a layer name. The Bondgen parser will use this name to generate a layer name in AutoCAD for this polygon.
NET_NAME - assuming the ring is a conductor, it should have a valid net name. If a ring is "not" a conductor, then some sort of placeholder name should be used i.e. DUMMY.
NUMBER_OF_POLYGONS - If this piece of the ring is a simple closed region it will consist of one polygon. However if it contains "cutouts" then there might be more than one polygon.
WIDTH - for a region the width = 0. However one could represent a trace using a finite width.
NUM_OF_VERTICES - the number of vertices (for this polygon) to follow. This makes life simpler for a parser. Note: if the number of vertices is expressed as a negative number, i.e. -25, this tells the parser that this is a cutout polygon and should be treated appropriately.
X,Y - coordinates of a vertex. There are no arcs in the RING definition. It is not necessary to limit a single pair of vertices per line but it makes the file more readable to do so.
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