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Re: types of "graphs"

From: Guus Schreiber <guus.schreiber@vu.nl>
Date: Wed, 9 May 2012 17:44:49 +0200
Message-ID: <4FAA90F1.2010902@vu.nl>
To: <public-rdf-wg@w3.org>


On 05-05-2012 15:02, Sandro Hawke wrote:
> Manu's comment [1] spurred me to try show why we care about the
> difference between a g-snap and a g-box.
>
> Intuitively, it matters to me because when I see
>
>     <g>  cc:license cc:by
>
> I want to know what is being licensed, or when I see
>
>     <g>  dc:creator "John Smith"
>
> I want to know what I'm being told he created.
>
> Also, the different types have different ideas about identity; there is
> only one g-snap containing any given set of triples, so that affects the
> kind of metadata we can meaningfully apply to it.
>
> To explore that a little more, I made a table of properties and
> whether/how I thought they applied to the different types of things we
> sometimes call an RDF "graph":
>
> http://www.w3.org/2011/rdf-wg/wiki/Containers_of_Triples

Sandro,

Nice document, thanks for putting this together.

I don't really understand why the last entry in your first table can 
only be a g-snap, but that's probably because I'm not a SPARQL intimate:

[[
   In Dataset X (Is this queriable as part of some particular SPARQL 
Dataset? A SPARQL Dataset is the abstract information against which a 
SPARQL query is executed.)
]]

Conceptually, the properties mentioned actually do not make sense to if 
they hold *only* for g-snaps. A g-snap is an abstract notion; a g-snap 
may derive such metadata from the container(s) it is  generated from 
(cf. the two penultimate properties, i.e. creator & license).

Guus




>
>     -- Sandro
>
> [1] "I really, really don't like all of the new terminology that the group
>      is creating - having both 'graph' and 'layer' doesn't help simplify
>      this stuff to Web developers. Use a base word, like 'graph' and
>      modify it for the different types of graphs - graph snapshot,
>      graph container, etc."
>            -- http://lists.w3.org/Archives/Public/public-rdf-wg/2012May/0096.html
>
>
Received on Wednesday, 9 May 2012 15:45:28 GMT

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