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

Hi Ettore,

Yes, I have a similar problem from UniProtKB that I can't currently know
the names of the many databases that we link too.
But gathering that would be annoying but trivial and a one time exercise.

Regards,
Jerven

On Thu, Oct 4, 2018 at 4:47 PM Ettore RIZZA <ettorerizza@gmail.com> wrote:

> 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
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>>>> >
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>>
>> --
>> Jerven Bolleman
>> me@jerven.eu
>>
>

-- 
Jerven Bolleman
me@jerven.eu