W3C home > Mailing lists > Public > public-vocabs@w3.org > May 2015

Re: URIs / Ontology for Physical Units and Quantities

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Wed, 06 May 2015 19:25:16 -0400
Message-ID: <554AA2DC.2060804@openlinksw.com>
To: public-vocabs@w3.org
On 5/6/15 6:31 PM, martin.hepp@ebusiness-unibw.org wrote:
> The problem is not the one time generation. The problems are as follows:
>
> 1. Copyright - Are you allowed to republish the code set as RDF?
> 2. Sustainability - Are you commited to keep the URIs dereferencable, or will some domain grabber take the domain name once the creator has completed his/her PhD and lost interest.
> 3. Updates - Will you keep the RDF version in sync whenever the standard changes?
>
> Unless there is a clear "yes" to all three questions, it is better to use the official codes than derived URIs.
>
> Martin

Martin,

What's wrong with:

<#someResolvableVariantOfIdentifier>
a owl:Thing ;
dcterms:identifier "{literal-variant-of-standard-identifier}" .

Which can be further embellished by Linked Data publisher in their 
ontology/vocabulary by adding the following:

dcterms:identifier
a owl:InverseFunctionalProperty .

Productive workflow:

1. Get the data dump in a spreadsheet
2. Save as CSV
3. Load into LOD or Google Refine
4. Map to relevant ontology (existing, or new)
5. Dump data into an RDF document
6. Publish (note: using # as indexical mechanism makes the publication 
Linked Open Data prinicples compliant off-the bat).


It can be done quite easily. I deliberatly opted not to do it :)


Kingsley
>
>
>
>> On 06 May 2015, at 23:56, Wes Turner <wes.turner@gmail.com> wrote:
>>
>> How much time do you think it would take to generate RDF (and namespaced URIs) from the linked spreadsheet?
>>
>> Mappings to/from UN/CEFACT codes (as owl:sameAs mappings to strings) could certainly be useful.
>>
>> On May 6, 2015 4:31 PM, "martin.hepp@ebusiness-unibw.org" <martin.hepp@ebusiness-unibw.org> wrote:
>> I think a validator should simply use the list of valid codes from the most recent UN/CEFACT document (available as MS Excel from http://www.unece.org/cefact/codesfortrade/codes_index.html).
>>
>> There might be unit of measurement ontologies out there that hold the UN/CEFACT Common Code string for a subset of all units as a literal value. But for validation, one should use the authoritative list from the Excel files (since they are updated from time to time).
>>
>> URIs are not better than strings for validation, because URIs are strings.
>>
>> Best wishes / Mit freundlichen Grüßen
>>
>> Martin Hepp
>>
>> -------------------------------------------------------
>> martin hepp
>> e-business & web science research group
>> universitaet der bundeswehr muenchen
>>
>> e-mail:  martin.hepp@unibw.de
>> phone:   +49-(0)89-6004-4217
>> fax:     +49-(0)89-6004-4620
>> www:     http://www.unibw.de/ebusiness/ (group)
>>           http://www.heppnetz.de/ (personal)
>> skype:   mfhepp
>> twitter: mfhepp
>>
>> Check out GoodRelations for E-Commerce on the Web of Linked Data!
>> =================================================================
>> * Project Main Page: http://purl.org/goodrelations/
>>
>>
>>
>>
>>> On 06 May 2015, at 20:34, Wes Turner <wes.turner@gmail.com> wrote:
>>>
>>> Thanks!
>>>
>>> I notice that with QUDT there are SI conversion factors and complete URIs for each unit.
>>>
>>> Is there a schema for validation of "schema:QuantativeValues supports all UN/CEFACT Common Codes"?
>>>
>>> (A similar quandry as with MedicalCode; where URI namespaces (like icd10:) would be more helpful for terminological validation and disambiguation than plain string keys)
>>>
>>> On May 6, 2015 4:26 AM, "martin.hepp@ebusiness-unibw.org" <martin.hepp@ebusiness-unibw.org> wrote:
>>>> Hi Wes,
>>>> sorry for a very late reply:
>>>>
>>>> Actually you could easily use schema:QuantitativeValue for both time and volume, with SEC as the unit code for t and LTR as the unit code for liters, and link both via schema:valueReference, or better, and owl:subProperty thereof.
>>>>
>>>> For the principle, see
>>>>
>>>>       http://wiki.goodrelations-vocabulary.org/Documentation/Structured_values_and_value_references
>>>>
>>>>
>>>> schema:QuantativeValues supports all UN/CEFACT Common Codes for units, which should cover all you need:
>>>>
>>>>
>>>>       http://wiki.goodrelations-vocabulary.org/Documentation/UN/CEFACT_Common_Codes
>>>>
>>>> (Mind the full list in the public Excel files, the page just highlights a small subset.)
>>>>
>>>> Best wishes / Mit freundlichen Grüßen
>>>>
>>>> Martin Hepp
>>>>
>>>> -------------------------------------------------------
>>>> martin hepp
>>>> e-business & web science research group
>>>> universitaet der bundeswehr muenchen
>>>>
>>>> e-mail:  martin.hepp@unibw.de
>>>> phone:   +49-(0)89-6004-4217
>>>> fax:     +49-(0)89-6004-4620
>>>> www:     http://www.unibw.de/ebusiness/ (group)
>>>>           http://www.heppnetz.de/ (personal)
>>>> skype:   mfhepp
>>>> twitter: mfhepp
>>>>
>>>> Check out GoodRelations for E-Commerce on the Web of Linked Data!
>>>> =================================================================
>>>> * Project Main Page: http://purl.org/goodrelations/
>>>>
>>>>
>>>>
>>>>
>>>>> On 01 May 2015, at 13:45, ☮ elf Pavlik ☮ <perpetual-tripper@wwelves.org> wrote:
>>>>>
>>>>> Hi Wes,
>>>>>
>>>>> On 01/26/2014 07:20 AM, Wes Turner wrote:
>>>>>> Say I am trying to share a tabular dataset. [1] There's metadata for
>>>>>> the Dataset, and there's metadata for the particular columns (which
>>>>>> applies to the particular data items).
>>>>>>
>>>>>> For example:
>>>>>>
>>>>>> t   volume (liters)
>>>>>> -----------------
>>>>>> 1  1
>>>>>> 2  0.7
>>>>>> 3  0.5
>>>>>> 4  0.3
>>>>>> 5  0.1
>>>>>>
>>>>>> Questions
>>>>>> ===========
>>>>>> # Is there (a good) way to specify these units and quantities (in
>>>>>> addition to XSD datatypes)?
>>>>> You might like to check out
>>>>> * https://iotdb.org/pub/iot-unit.html
>>>>>
>>>>> Cheers!
>>>>>
>>>>>
>
>


-- 
Regards,

Kingsley Idehen	
Founder & CEO
OpenLink Software
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Received on Wednesday, 6 May 2015 23:25:39 UTC

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