Re: Established vocabularies for units in RDF?

Hi Paul,

DBpedia has many unit datatypes for a long time now
e.g. search for datatype in http://dbpedia.org/ontology/ (they do not
dereference)

Also Wikidata added units recently but I do not know details on their
representation

An article you might find interesting is "Supporting Arbitrary Custom
Datatypes in RDF and SPARQL"
by Maxime Lefrançois & Antoine Zimmermann

On Tue, Aug 9, 2016 at 5:19 AM, Jeen Broekstra <jeen.broekstra@gmail.com>
wrote:

>
> Another contender is the Ontology of Units of Measure (OM), developed by
> Wageningen University:
>
>  http://www.wurvoc.org/vocabularies/om-1.8/
>
> Probably not quite as established as QUDT, but still actively maintained.
> Paper about it here (including a section comparing it with QUDT):
>
>   http://www.semantic-web-journal.net/sites/default/files/swj177_7.pdf
>
> Cheers,
>
> Jeen
>
> On 9/08/16 10:51, Simon.Cox@csiro.au wrote:
>
>> QUDT is the most mature project in this space.
>>
>> However, it has been struggling with maintenance.
>>
>>
>>
>> http://qudt.org
>>
>>
>>
>> *From:*Paul Houle [mailto:ontology2@gmail.com]
>> *Sent:* Tuesday, 9 August 2016 12:24 AM
>> *To:* semantic-web@w3.org
>> *Subject:* Established vocabularies for units in RDF?
>>
>>
>>
>> I am wondering today what is the state of the art in terms of representing
>> measurement units in RDF.  I break this down into four layers:
>>
>>
>>
>> (1) Measurement units regarded as basic,  such as "meter",  "degree
>> centigrade"
>>
>> (2) Measurement units in the abstract such as "length",  "time"
>>
>> (3) Measurement units created by the composition of basic units
>> ("meters"/"seconds")
>>
>> (4) So far we are representing measurement units in and of themselves,
>> but (4)
>> would including associating measurement units with properties in a schema
>> and/or
>> specific instance values.
>>
>>
>>
>> What is out there to address this at the various levels?
>>
>>
>>
>> --
>>
>> Paul Houle
>>
>>
>>
>> *Applying Schemas for Natural Language Processing, Distributed Systems,
>> Classification and Text Mining and Data Lakes*
>>
>>
>> (607) 539 6254    paul.houle on Skype   ontology2@gmail.com
>> <mailto:ontology2@gmail.com>
>>
>>
>>
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>>
>> http://basekb.com/gold/
>>
>>
>>
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>>
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>>
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>>
>>
>
>


-- 
Kontokostas Dimitris