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Re: Purpose and Extent

From: Owen Stephens <owen@ostephens.com>
Date: Wed, 19 Jul 2017 14:38:03 +0100
Message-Id: <1ED0BDAD-D8EA-4C74-9323-67F471731D6F@ostephens.com>
Cc: Richard Wallis <richard.wallis@dataliberate.com>, "Roke, Elizabeth Russey" <erussey@emory.edu>, Jane Stevenson <jane.stevenson@jisc.ac.uk>
To: public-architypes <public-architypes@w3.org>
I’ve fleshed out the Extent proposal with a bit more detail now.

The thing that I’m unhappy about in terms of modelling is that where we have multiple parts to the extent statement we end up with two properties on the object, which I think leaves the extent statement ambiguous. So for example for an extent statement of "1 folder; 5 design drawings” leads to two separate extent statements in the current proposal (unless you take the easy way out and jut dump it all in a single string).

Comments and additions to https://www.w3.org/community/architypes/wiki/Extent_proposal very welcome

Owen

Owen Stephens
Owen Stephens Consulting
Web: http://www.ostephens.com
Email: owen@ostephens.com
Telephone: 0121 288 6936

> On 18 Jul 2017, at 18:09, Richard Wallis <richard.wallis@dataliberate.com> wrote:
> 
> I wouldn’t be apposed to proposing a property that takes QuantitativeValue as an expected type to fit this requirement, if we could come up with some agreed guidelines and examples of how it would be used.
> 
> There has been much discussion in Schema.org around UN/CEFACT beyond its mention in QuantitativeValue description - the world of IoT are very focused on that too.  If we could leverage that interest to help our proposals all the better.
> 
> Do we have the consistency in archive data to take this approach?
> 
> I would expect to be challenged on a simple name of ‘extent’ for that property as either it is too specific to archives/libraries or; its broader understanding “the area covered by something” may cause confusion to wider adopters of Schema to be thinking in a spatialCoverage direction.  So we might need to be creative in naming, description and examples.
> 
> Maybe we could loop in the library requirements at the same time….  Just a thought.
> 
> ~Richard.
> 
> 
> 
> Richard Wallis
> Founder, Data Liberate
> http://dataliberate.com <http://dataliberate.com/>
> Linkedin: http://www.linkedin.com/in/richardwallis <http://www.linkedin.com/in/richardwallis>
> Twitter: @rjw
> 
> On 18 July 2017 at 08:45, Owen Stephens <owen@ostephens.com <mailto:owen@ostephens.com>> wrote:
> I agree that the definition doesn’t really seem to fit archives and their content
> 
> Doing a bit more looking around, perhaps a better starting point is http://schema.org/QuantitativeValue <http://schema.org/QuantitativeValue>. This is a generic Type allowing you to specify a value (amount), and either unitCode or unitText
> If you look further down the page you can see all the properties currently in schema.org <http://schema.org/> that can be expressed as a QuantitativeValue. These include:
> 
> height
> width
> depth
> weight
> 
> So just thinking out loud here - a couple of options:
> 
> 1. Add new properties that represent the types of measure we want to express (length, volume) - and let these take a QuantitativeValue
> So you’d get something like:
> schema:volume
>         schema:QuantitativeValue
>                 schema:unitText “boxes”
>                 schema:value “3”
> 
> schema:length
>         schema:QuantitativeValue
>                 schema:unitCode “LF”
>                 schema:value “12”
> 
> 2. Add a single new property of “extent” (or similar) which takes a QuantitativeValue
> schema:extent
>         schema:QuantitativeValue
>                 schema:unitText “boxes”
>                 schema:value “3”
> 
> schema:extent
>         schema:QuantitativeValue
>                 schema:unitCode “LF”
>                 schema:value “12”
> 
> Or we could implement both of course with ‘extent’ being a catchall
> 
> 1. appeals as it avoids the library/archive use of ‘extent’ which is very specific and different to what might be generally understood. On the downside 1 requires us to agree on the set of measurements we need - and some may not be obvious (e..g if you are measuring something in ‘sheets’ is it a volume? or what?)
> 
> Owen
> 
Received on Wednesday, 19 July 2017 13:38:29 UTC

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