[Architecture] Standards for defining value space in Registry

Antranig Basman antranig.basman at colorado.edu
Mon Feb 18 15:23:58 EST 2013

Hi Christophe - thanks for this interesting question and references. Our architectural plan has been to 
adopt as many of the provisions of JSON Schema where possible, and where not possible, to make modest 
specialised extensions. This standard has recently gone to a new IETF draft as of Jan 30th 2013, and the 
section which seems most relevant to your question is this:


The primitive types these rules are referred to are these:


Where values are scalars it seems they can be easily accommodated in this system. More complex types wuch as 
languages and colours would require appropriate references to other relevant specifications - for example 
last year I believe you determined that our choice for language value spaces would be covered by IETF BCP 47 
(mailing of Oct 11 2012)


On 18/02/2013 09:36, Christophe Strobbe wrote:
> Hi,
> In today's joint telecon on Registry terms, we added a new column to the
> table with Registry fields to define what the format of each field should
> be. One of these fields is "ValueSpace": each term should have a
> machine-readable definition of the value space. The next question then is:
> How do you write machine-readable descriptions of a value space. Values
> may be colours (e.g. RGBA), integers, floating point numbers, text strings
> (from enumerated values), URIs, times of day, language identifiers,
> brightness values, loudness values, etc etc etc.
> It would be nice if we could reuse an existing standard or convention
> instead of inventing our own. There are some standards that define ways of
> describing data types, like XML Schema Part 2
> <http://www.w3.org/TR/xmlschema-2/> and the OpenAjax Metadata 1.0
> Specification
> <http://www.openajax.org/member/wiki/OpenAjax_Metadata_1.0_Specification_Datatypes>.
> So I would like to ask if you know other standards that could be use for
> this and request comments on how well they would fit our needs.
> See the Value Space section in the wiki page about the Registry:
> <http://wiki.gpii.net/index.php/Common_Terms_Registry#Value_Space>.
> Best regards,
> Christophe

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