Comment 4 for bug 168753

Ammusionist: The Viewbox method is the correct solution for this.
Can you provide more detailed information how do you workaround using viewbox?

There were some discussions about this issue on the inkscape-dev mailing list:
Thread "Problem with real units (mm)"
http://www.nabble.com/Problem-with-real-units-%28mm%29-tt14966336.html#a14971033

And I have started a Blueprint about units:
https://blueprints.launchpad.net/inkscape/+spec/real-units

Please add any additional information to this blueprint which eases the implementation of
this feature.