Re: [h5md-user] Finalization of units module

[Peter Colberg]

Hi all,

Following external pressure to publish or perish, I revised the units
module by defining the "SI" unit system to encompass SI base units,
SI derived units, and SI prefixes [1].

[1] http://www.bipm.org/en/si/si_brochure/general.html

I also updated the test case in lua-units [2].

[2] http://git.colberg.org/lua-units/tree/examples/h5md.lua

The solution will make everybody unhappy. For the use of non-SI units,
the unit attribute can still be written using a scalar prefix and an
SI unit. Alternatively, the values can be converted to an SI unit
using the cv_convert_* functions [3] of the udunits2 library.

[3] 
http://www.unidata.ucar.edu/software/udunits/udunits-2.2.2/doc/udunits/udunits2lib.html#Value-Conversion

Peter