To try and make unit description consistent here is a proposed template.
This would apply to tags like ele, est_width, circumference, height, width,
maxwidth, minwidth, distance. A separate table could be made for speed &
weight.
Use as follows:
{{Unit_Tagging_Length|tag_name|furlongs}}
The template is defined at:
http://wiki.openstreetmap.org/wiki/Template:Unit_Tagging_Length
Other unit pages include:
http://wiki.openstreetmap.org/wiki/Category:Units
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This particular summary promotes the notion of "human centred tagging",
with parsers left to make conversion to computer readable units. It also
promotes explicit numbers (e.g. 20 m) over implicit ones ( e.g. 20 ).
Given the variety of unit styles already in the database, this seems to be
the most pragmatic approach.
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