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These guys may help http://www.artwork.com/odb++/odb++_overview.htm Something to do with Valor (Frontline), now part of MentorGraphics.
More info http://en.wikipedia.org/wiki/ODB%2B%2B
It looks like the equivalent of STEP for circuit boards. Where Gerber typically captures the artwork, ODB++ must capture the schematic, the artwork, the board outline, probably package dimensions and placement for the components.
http://www.frontline-pcb.com/category/ODBFAQ
More info from http://www.odb-sa.com/partners/ (ODB++ Solutions Alliance)
Creo View ECAD reads ODB++ for visualization and comparison of ECAD PCB product-models whilst being fully integral to PTC’s PLM solutions.
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