Re: Established vocabularies for units in RDF?

Maybe this could help. I'm attempting to render metadata about RDF
statements elaborating a class oriented resource kinds classification
system. Basically if the object '32' is used in statements with persons and
ages as their subjects and predicates I may infer that the object is a
number that represent years that represents an age. This due to some
heuristics and aggregation of class and meta-classes of resources according
their multiple occurrences in statements.

The 'kinds' itself are reified so if there exists an 'age' object kind
there will be an object reifying it as subclass of an object 'years' which
could be subclass of 'integer' object. Concrete object instances (ages,
durations) may be arranged in such hierarchies so triple contexts (quads)
may contain, for example, time metadata (some person's age at a given
moment in time).

The document I'm sending does not explain all concepts but the necessary
arrangement of entities for performing the aforementioned techniques.

Sebastián.
On Aug 19, 2016 7:06 PM, "Pat Hayes" <phayes@ihmc.us> wrote:

> One quick comment, QUDT seems to assume that all measure scales can be
> expressed as multiples of a unit, but this is not the case for some measure
> scales, eg Mohr hardness or the Beaufort wind scale, which are purely
> ordinal. No doubt this is of little importance to anyone not wishing to use
> an ordinal scale, however.
>
> Pat Hayes
>
> On Aug 19, 2016, at 8:45 AM, Norman Gray <norman@astro.gla.ac.uk> wrote:
>
> >
> > Greetings.
> >
> > Paul Houle asked:
> >
> >>>> I am wondering today what is the state of the art in terms of
> representing
> >>>> measurement units in RDF.
> >
> > As Simon Cox mentioned, QUDT <http://qudt.org> is very mature.  It's
> comprehensive and thoughtful, and the authors are fully aware of the
> various subtleties which can crop up with units.  That it's associated with
> both TopQuadrant and NASA is a recommendation.
> >
> > The current version is 1.1, the site says 'Release 2 of QUDT is being
> published incrementally.', and the last update to that page was in August
> 2016.
> >
> > There already seems to be worryingly many units ontologies (ie, more
> than one).  QUDT has worked for me (I've used it for a project <
> https://bitbucket.org/nxg/unity> concerned with parsing unit strings).
> >
> > All the best,
> >
> > Norman
> >
> >
> > --
> > Norman Gray  :  https://nxg.me.uk
> > SUPA School of Physics and Astronomy, University of Glasgow, UK
> >
> >
>
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