intro
   author
   motivation
fmt-model
   differences
   example
   properties
low
   porting
   text_bin
   flat-tree
   txt:field
   txt:strings
   txt:tree
   compare
high
   coordsys
   units
   stateless
   assum-obj
   assum-layer
   arc
   degen
   text
   poly
* subc_local
   padstack
bye
   bye

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High: subcircuit local

origin
rotation
side
portable layer descrption

PCB layers.
Source: https://www.pcbgogo.com/Article/Choosing_the_Correct_Thickness_for_PCB_Prototype.html

>4_11.html