Check for completely overlapping polygons of the same layer

Document created by burr_shaw on Oct 16, 2012
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The rule check below takes advantage of the fact that the AND operation works on unmerged data.



     @ fully overlapping polygons in the input on layer METALFILL

     overlapping = AND METALFILL

     not_overlapping = METALFILL NOT overlapping

     overlapping NOT TOUCH not_overlapping // this eliminates cases that are not completely coincident