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   Values with an associated unit of measurement?

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  • From: Tom Chmielenski <Tom.Chmielenski@bentley.com>
  • To: xml-dev@xml.org
  • Date: Thu, 6 Jul 2000 13:38:10 -0400

Are there any XML initiatives out there that are currently working on
defining a standard way to represent a numerical value with an associated
unit of measurement?

For instance, suppose I wanted to represent a length of 6 inches.  It could
be represented it a number of ways, here are a few:

<Length>6 inches</Length>
<Length>6 <Units>inches</Units></Length>
<Length units="inches">6</Length>
<Length ref="urn://some.com/standard/units/#US.linear.in">6</Length>
<Length system="US" type="linear" units="inches">6</Length>

If no standard is emerging in this area, (and understanding that there is no
one 'right' way to model this data), how would one model this data such
1.  Conversion of values could be preferred (by XSLT or an app), if
necessary.  Thus, 6 inches could also be represented as 0.5 feet, or 152.4
mm, etc. and still be equivalent.  (Where we do define the conversion
factors also?).  

2.   A standard way to define a unit of measurment is established.  Thus,
all possible combinations ["inches",  "in.", "in", "INCHES", etc.] of the
unit of measurement do not have to be defined.  

3.  A given value has the proper units attached.  Thus <Length>5 square
meters</Length> is invalid.

Seems like a similiar issue would occur with currency values (EURO, USD,

Thanks in advance.

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