What is Virtual Boundary Conditions (VBC) which is used in Catia Drawing or Drafting.?

Can you explain with simple example.
Thanks in advance.

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Virtual condition is the theoretical extreme boundary condition of a feature of size generated by the collective effects of MMC and any applicable geometric tolerances.

For more detail go to below link
http://www.meadinfo.org/2009/07/virtual-condition-gd.html

 
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