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Re: [DCAT] dcat:mediaType use .

From: Richard Cyganiak <richard@cyganiak.de>
Date: Fri, 1 Nov 2013 07:06:08 +0100
Message-Id: <5DCA361A-5DF0-4B8B-AE3D-DA0C7D994C5C@cyganiak.de>
Cc: "Maali, Fadi" <fadi.maali@deri.org>, Government Linked Data Working Group <public-gld-wg@w3.org>
To: Ghislain Atemezing <auguste.atemezing@eurecom.fr>


> On 30 Oct 2013, at 10:08, Ghislain Atemezing <auguste.atemezing@eurecom.fr> wrote:
> 
> Hi Fadi, all
> 
> While looking at the basic example in the spec [1], I have a small question on the use of dcat:mediaType.
> The example said:
> 
> [[ :dataset-001-csv
>       a dcat:Distribution ;
>       dcat:downloadURL <http://www.example.org/files/001.csv> ;
>       dct:title "CSV distribution of imaginary dataset 001" ;
>       dcat:mediaType "text/csv" ;
>       dcat:byteSize "5120"^^xsd:decimal ;
>       .
> ]]
> 
> Since the range of dcat:mediaType is dct:MediaTypeOrExtent, I would have expected having something like
>  [[
>    .....
>     dcat:mediaType [ a dct:MediaTypeOrExtent; rdfs:label "text/csv" ;
>    ...
>   ]]
> 
> Am I wrong?

For all we know, dctype:MediaTypeOrExtent could be a datatype that includes a subset of xsd:string.

The range declaration seems to be there simply because it's inherited from dct:format. I'd rather get rid of that subproperty assertion than using the pointless blank node.

> At the same time, I came across this resource of some registered formats at W3C namespace http://www.w3.org/ns/formats/. Yes, W3C!! Could it be possible to "recommend" somehow to the publishers the use of those uris in the spec? So for example, if a distribution is in Turtle, we would have
>    [[ dcat:mediaType <http://www.w3.org/ns/formats/Turtle> ]]
> 
> WDYT ?

The problem with Ivan's format identifiers is that they only cover a handful of formats. Recommending the use of a particular list of identifiers that doesn't include CSV will make life not easier but more complicated for most implementers, I think.

Best,
Richard



> 
> Cheers,
> 
> Ghislain
> 
> [1] https://dvcs.w3.org/hg/gld/raw-file/default/dcat/index.html#basic-example
> -- 
> Ghislain Atemezing
> EURECOM, Multimedia Communications Department
> Campus SophiaTech
> 450, route des Chappes, 06410 Biot, France.
> e-mail: auguste.atemezing@eurecom.fr & ghislain.atemezing@gmail.com
> Tel: +33 (0)4 - 9300 8178
> Fax: +33 (0)4 - 9000 8200
> Web: http://www.eurecom.fr/~atemezin
> 
> 
Received on Friday, 1 November 2013 06:06:32 UTC

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