[cad-linux] .dxf or .dwg?

Hi list,

We are planning to make a gpl'ed cam software, working
primarily on gnu/linux.

Right now, we are thinking of accepting a .dxf or .dwg
file as input and generating a g-code tool path.

My question, which should be the preferred input
format? .dxf or .dwg? I would also like to know that
advantages and disadvantages of either of these, and,
more importantly, the kind of libraries that are
available for their manipulation...

I saw the opendwg.org alliance and saw that they have
some libraries that are designed to work with the .dwg
format...however, linux is not mentioned in the OS
platforms. Has anyone successfully used these
libraries with linux?

Thanks in advance,
Sagar

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