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Re: Use the void and schema.org [Was; Re: LODAtlas 1.0 release - Browsing Linked Data Catalogs]

From: Ettore RIZZA <ettorerizza@gmail.com>
Date: Thu, 4 Oct 2018 16:46:38 +0200
Message-ID: <CAGq-dorVaWAFji9M1CcTzoCoj4sr5p3EgG0+ouB+vEUEwqFsbw@mail.gmail.com>
To: me@jerven.eu
Cc: emmanuel.pietriga@inria.fr, stellato@uniroma2.it, public-lod@w3.org
Thank you very much, Jerven. It's a relatively new topic for me, but I'm
numb to see how much there is to do to document LOD datasets. To take the
example of Wikidata, it took a lot of effort to produce the metadata needed
to include it in the LOD cloud diagram
<https://www.wikidata.org/wiki/User:Lucas_Werkmeister_(WMDE)/LOD_Cloud>...
and nobody seems to have a clear idea of the number of RDF datasets linked
to it.

There is clearly a problem in the documentation of RDF datasets, and the
LOD cloud does not seem to me at all a faithful glimpse.

On Thu, 4 Oct 2018 at 16:35, Jerven Bolleman <me@jerven.eu> wrote:

> Hi Ettore
>
> http://example.org/*.well-known/void*
> e.g
> https://sparql.uniprot.org/.well-known/void
>
> In any case it is much simpler to paste in one single URL and select
> update (hourly, monthly, yearly etc...) than
> 60 fields. Considering our void file is 22MB uncompressed with 192283
> triples I think I won't be typing that in anytime soon.
>
> Regards,
>
> Jerven
>
>
> On Thu, Oct 4, 2018 at 4:28 PM Ettore RIZZA <ettorerizza@gmail.com> wrote:
>
>> Dear all,
>>
>> sorry if my question seems profane, but is there a standard or a
>> consensus proposal on the best way to store Void metadata in a LOD dataset?
>> something like "at the root of the site, in a file called void.rdf, like a
>> robot.txt". I see for example that DBpedia has a Void page
>> <http://dbpedia.org/void/page/Dataset>, but it is impossible to find it
>> without crawling the entire web site.
>>
>> Regards,
>>
>> Ettore Rizza
>>
>> On Thu, 4 Oct 2018 at 16:01, emmanuel.pietriga@inria.fr <
>> emmanuel.pietriga@inria.fr> wrote:
>>
>>> Thanks Armando.
>>>
>>> In LODAtlas, we are particularly interested in the links between
>>> datasets, and showing them to users so that they understand how a dataset
>>> fits in the whole cloud. That’s why we use old.datahub/lod-cloud data in
>>> the first place. Is there also support in the sort of tools you mention to
>>> declare what datasets the one of interest links to?
>>>
>>> best,
>>> Emmanuel
>>>
>>> > On 4 Oct 2018, at 14:42, Armando Stellato <stellato@uniroma2.it>
>>> wrote:
>>> >
>>> > Just marginal on the main topic here, however I thought it good to put
>>> my two cents in support of the automatic generation of metadata profiles
>>> for datasets.
>>> >
>>> >
>>> >
>>> > The Collaborative editor for OWL ontologies, SKOS(/XL) thesauri and
>>> OntoLex lexicons VocBench 3 [1] allows for the semi-automatic generation of
>>> dataset metadata profiles [2].
>>> >
>>> > The system prompts for generic metadata (title, homepage etc..) about
>>> the dataset, while everything that can be computed over the data is
>>> generated automatically.
>>> >
>>> >
>>> >
>>> > Currently there are generators for:
>>> >
>>> > 1.      VoID and LIME [3,4] descriptions. LIME is the LInguistic
>>> MEtadata module developed in the context of the OntoLex specification,
>>> though as a metadata vocabulary it can be used for any kind of dataset,
>>> providing statistical and qualitative information about the lexical asset
>>> of datasets
>>> >
>>> > 2.      DCAT/DCAT-AP [5] profiles
>>> >
>>> > 3.      ADMS
>>> >
>>> >
>>> >
>>> > and they are loaded as implementation of an extension point, so other
>>> implementations could be added
>>> >
>>> >
>>> >
>>> > Cheers,
>>> >
>>> >
>>> > Armando
>>> >
>>> >
>>> >
>>> > [1] http://vocbench.uniroma2.it/
>>> >
>>> > [2]  http://vocbench.uniroma2.it/doc/user/metadata_vocabularies.jsf
>>> >
>>> > [3] https://www.w3.org/2016/05/ontolex/#metadata-lime
>>> >
>>> > [4] https://link.springer.com/chapter/10.1007/978-3-319-18818-8_20
>>> >
>>> > [5]
>>> https://joinup.ec.europa.eu/solution/dcat-application-profile-data-portals-europe
>>> >
>>> > [6] https://www.w3.org/TR/vocab-adms/
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > From: Gray, Alasdair J G <A.J.G.Gray@hw.ac.uk>
>>> > Sent: Thursday, October 4, 2018 1:58 PM
>>> > To: emmanuel.pietriga@inria.fr
>>> > Cc: Jerven Bolleman <me@jerven.eu>; Linking Open Data <
>>> public-lod@w3.org>
>>> > Subject: Re: Use the void and schema.org [Was; Re: LODAtlas 1.0
>>> release - Browsing Linked Data Catalogs]
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > On 4 Oct 2018, at 12:00, emmanuel.pietriga@inria.fr wrote:
>>> >
>>> >
>>> >
>>> > - Has VoID achieved good coverage yet? (I remember reading that few
>>> datasets were exposing VoID descriptions, but that may have been several
>>> years ago and things might have changed)
>>> >
>>> >
>>> >
>>> > Harvesting VoIDs/schema.org would be a good way of encouraging up
>>> take. It is likely that there will be a big increase in schema.org
>>> markup now that Google have released a dataset search tool.
>>> >
>>> >
>>> https://www.blog.google/products/search/making-it-easier-discover-datasets/
>>> >
>>> >
>>> >
>>> > - How do we get those decentralized VoID descriptions? Is there a
>>> crawling service somewhere that would give us access to such descriptions?
>>> >
>>> >
>>> >
>>> > Starting, as Jerven suggested, by allowing people to provide you the
>>> URI of the VoID, but also following the links in VoIDs to other datasets.
>>> >
>>> >
>>> >
>>> > Alasdair
>>> >
>>> >
>>> >
>>> > --
>>> >
>>> > Alasdair J G Gray
>>> >
>>> > Associate Professor in Computer Science,
>>> > School of Mathematical and Computer Sciences
>>> > Heriot-Watt University, Edinburgh, UK.
>>> >
>>> > Email: A.J.G.Gray@hw.ac.uk
>>> > Web: http://www.macs.hw.ac.uk/~ajg33
>>> > ORCID: http://orcid.org/0000-0002-5711-4872
>>> > Office: Earl Mountbatten Building 1.39
>>> > Twitter: @gray_alasdair
>>> >
>>> >
>>> >
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> --
> Jerven Bolleman
> me@jerven.eu
>
Received on Thursday, 4 October 2018 14:47:39 UTC

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