Luca,
Take a look at http://microformats.org/wiki/measure and particularly
http://microformats.org/wiki/measure-brainstorming#Straw_man
If I understand your suggestion correctly, what is currently missing is
the margin of error.
The need for microformatting margins of error hasn't surfaced before
your post, I believe. It would be useful as a first step to collect some
samples from the Web and post them in the examples section to justify to
the community that there is such a need.
Hope this helps,
Guillaume
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