can you please elaborate?
The Arduino uno has four mounting holes and 5 specific-sized connectors (say, 8mm above the board) that are in well-defined spots (shield connectors + ISP.)
It has two additional connectors (power and USB) in a location that is less completely defined, with the exact measurements somewhat incompletely defined (miniUSB, microUSB, various power connectors.) In between these standard components are a bunch of other components whose locations and shapes are NOT standard, but are assumed to be "shorter" than the connectors, and not obscure the mounting holes. I'm wondering if there is a standard practice for drawing those other components, as well as the "fuzzy" power/usb connectors in a way that describes their limits rather than their exact dimensions...