[QUANTITY] Choosing default accuracy/units values
pdidelon at cea.fr
Tue May 18 01:10:33 PDT 2004
Patrick Dowler wrote:
> I agree that default units and default accuracy/error should follow the same
> rules. However, to be successful the VO really needs to get people (force them
> if necessary) to not be lazy, so I would prefer making specification of units
> and accuracy mandatory (in the schema) and have some special values that can
> be easily used, like <unitless> and <exact> and <uknownUnits> and
> <unknownAccuracy>. There should be no default value.
Isn't specila tag values <units>Number</units>, <accuracy>exact</accuracy>,
<units>unknown</units> and <accuracy>unknown</accuracy> better than
special tag names?
> Yes, this does potentially increase the size of the serialised form, but the
> benefits outweigh the cost, IMO. And sure, those unknown tags are especially
> large, but they should be rare (who wants data with those tags in there?) and
> providers of such tags/data will be discouraged by their usage stats :-)
A question is what will be the main usage of Quantities, always used as components
in big doc., or as elementary information to specify searching criteria.
> my 2c,
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