How to gnerate an error if a layer does not exist in the layout

Document created by chung_lee on Sep 20, 2012
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Two options:
===========
1) full_chip = EXTENT DRAWN ORIGINAL
    Oxide_empty {  @Oxide must exist in layout
        full_chip NOT INTERACT oxide
    }

 

OR:

 

2) full_chip = EXTENT DRAWN ORIGINAL
    Oxide_empty {   @Oxide must exist in layout
        DFM PROPERTY full_chip oxide [ x = COUNT (oxide)] == 0
    }

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