[NeXus-tech] "units" in the manual now clarified

[Pete R. Jemian]

The manual now reads:
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2.2.4 NeXus units
NeXus units are written as a string describing the engineering units. The string should be appropriate for the value. Values for
the NeXus units must be specified in a format compatible with Unidata UDunits [see footnotes 2 and 3] utility (in particular, see the now-deprecated
udunits.txt).
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In the DocBook source, I added this comment:
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                 <!--
                     What about backwards compatibility with older NeXus data files?
                     Since we do not check or validate the units, seems that we're covered.
                     A comment here might suffice.
                 -->
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Since we don't validate the units attribute, is it true that we are covered for backwards compatibility?

Pete

-- 
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  Pete R. Jemian, Ph.D.                <jemian at anl.gov>
  Beam line Controls and Data Acquisition, Group Leader
  Advanced Photon Source,   Argonne National Laboratory
  Argonne, IL  60439                   630 - 252 - 3189
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     Education is the one thing for which people
        are willing to pay yet not receive.
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