totally agree - hopefully XSD facets provide a solid start to
meeting those concrete requrements - thanks.
On 19.12.2012 14:09,
Gregor Hagedorn wrote:
On 19 December 2012 20:01,
<jmcclure(a)hypergrove.com> wrote:
> Hi Gregor - the root of the
misconception I likely have about significant
digits and the like, is
that such is one example of a rendering parameter not a semantic
property.
It is about semantics, not formatting.
In science
and engineering, the number of significant digits is not
used to right
align numbers, but to semantically
indicate the order of
magnitude of
the accuracy and/or precision of a
measurement or
quantity. Thus, the
weight of a machine can be
given as 1.2 t (exact
to +/- 50 kg), 1200
kg (+/- 1 kg), or 1200.000
g.
This is not part of IEEE floating
point numbers, which always have the
type dependent same precision or
number of
significant digits,
regardless whether this is semantically
justified or not. IEEE 754
standard double always has about 16 decimal
significant digits, i.e.
the value 1.2 tons will always be given as
1.200000000000000 tons.
This is good for calculations, but lacks the
information for final
rounding.
Gregor
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