- layer vs. object type
- element-line again...
- minimize layers, use different types (gEDA/PCB footprints)
- minimize types, express purpose by layer (pcb-rnd)
- even worse: mixtures (PADS ASCII)
- cases:
- copper
- silk
- mask, paste, adhesive
- outline, cutouts
- documentation layers (fab, assy)
- layer pro: layer is data, easier to extend
- fixed layer setup vs. anything goes
- "16 copper layers should be enough" -> integer layer IDs
- "silk/mask/paste never intern" (rigid-flex boards!)
- "imply substrate" -> thickness, simulation
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Source: pcbunlimited.com
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