Re: License unknown

Hi Jerven,

We are trying to ensure that a license is provided for a dataset, and that only one license is provided. (We are closing the world in certain areas.)

Our proposed solution is written up at
https://github.com/joejimbo/HCLSDatasetDescriptions/issues/65

Alasdair

On 2 Jun 2014, at 16:47, Jerven Bolleman <me@jerven.eu<mailto:me@jerven.eu>> wrote:

Hi Alasdair,

It is good practice in my opinion to not state unknown facts. If you
want to state there should be a license but you don't know it I think
some owl modelling is called for.

e.g. roughly like this.

dusty_data a dct:Dataset .
dusty_data rdfs:subClassOf [ a owl:Restriction ;
                                           owl:onProperty dct:license ;
                                           owl:minCardinality 1 ]


If anyone does something like

dusty_data a dct:dataset .
dusty_data dct:license bad_example:unknown_license .

and then someone figures out it has a license .

dusty_data a dct:Dataset .
dusty_data dct:license cc:zero .

And puts all those triples into one store/ontology then queries will
start to return wrong data.

SELECT ?datasetWithALicense
WHERE {
?datasetWithALicense dct:license ?license .
}

Will give 2 bindings for ?dataset and ?license one of them being wrong now.

If you ask the same question depending on the better modelling then
you get the correct answer in both cases.

SELECT ?datasetWIthoutLicense
WHERE {
?datasetWIthoutLicense a dct;Dataset .
MINUS ( ?datasetWIthoutLicense dct:license ?license )
}

SELECT ?datasetWIthALicense
WHERE {
?datasetWIthALicense a dct;Dataset .
?datasetWIthALicense dct:license ?license .
}

Both give the expected results.


In general in RDF just state what you know and describe what you don't know.

Regards,
Jerven

On Mon, Jun 2, 2014 at 5:25 PM, Gray, Alasdair J G <A.J.G.Gray@hw.ac.uk<mailto:A.J.G.Gray@hw.ac.uk>> wrote:
Hi,

I am working to help shape the Healthcare and Life Sciences community
profile for describing datasets, current version available from [1]

One of our goals is that there is a minimal set of properties that are
available for all datasets, and we would like these properties to include
the license. However we have the problem that for several legacy datasets
the license is simply unknown. Does anyone know of a resource that can be
used to represent that the license is unknown as the value of a
dcterms:license predicate?

Thanks

Alasdair

[1] https://github.com/joejimbo/HCLSDatasetDescriptions

Alasdair J G Gray
Lecturer in Computer Science, Heriot-Watt University, UK.
Email: A.J.G.Gray@hw.ac.uk<mailto:A.J.G.Gray@hw.ac.uk>
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--
Jerven Bolleman
me@jerven.eu<mailto:me@jerven.eu>

Alasdair J G Gray
Lecturer in Computer Science, Heriot-Watt University, UK.
Email: A.J.G.Gray@hw.ac.uk<mailto:A.J.G.Gray@hw.ac.uk>
Web: http://www.alasdairjggray.co.uk<http://www.macs.hw.ac.uk/~ajg33>
ORCID: http://orcid.org/0000-0002-5711-4872
Telephone: +44 131 451 3429
Twitter: @gray_alasdair







----- 
Sunday Times Scottish University of the Year 2011-2013
Top in the UK for student experience
Fourth university in the UK and top in Scotland (National Student Survey 2012)

We invite research leaders and ambitious early career researchers to 
join us in leading and driving research in key inter-disciplinary themes. 
Please see www.hw.ac.uk/researchleaders for further information and how
to apply.

Heriot-Watt University is a Scottish charity
registered under charity number SC000278.