Re: Data sets of LOD

Thanks Keith. I was aware of VoID and the lov engine. That's the right
direction but not the level of detail that we have in mind.

In the scenario of a (de-centralized) data marketplace, the
metadata/description for a dataset stored in a quad store could be
expressed as triples with the named graph URI as the subject.

A requirement for unambiguous representation of the dataset description
would be that values would come from a namespace, preferrably one provided
by an ontology so that machine reasoning can be used on the constraints.

One test case for update frequency could be:

How do I write a SPARQL query to retrieve all versions of DrugBank that
have an update frequency that is more frequent than yearly?

Note that there is no assumption of only one version of the RDF. There
could be tens of versions, or more.

where the update frequency could be more specific than the current
possibilities in http://purl.org/NET/dady#UpdateFrequency. Presumably, you
would have a term URI for each of hourly, daily, weekly, monthly, yearly,
etc. making the value machine consumable and 'machine reasonable'. So, the
values should not be string literals.

BTW, there are other types of information, such as license type that we
also would like to encode with precise URIs for the values. These types of
information are of great importance to some consumers of the data such as
pharmaceutical companies.

Cheers,
Scott

On Wed, Nov 21, 2012 at 3:12 PM, Keith Alexander <
keithalexander@keithalexander.co.uk> wrote:

> Hi
>
> On Wed, Nov 21, 2012 at 1:58 PM, M. Scott Marshall <
> mscottmarshall@gmail.com> wrote:
>
>> In discussions at the Biohackathon 2011 (Kyoto), we agreed that a
>> standard data set description would make it easier to consume distributed
>> data such as LOD. We created a wishlist of metadata that we would like to
>> be able to consume via SPARQL, including date of last update of RDF
>> rendering and date of last update of source data (if the RDF is an
>> additional representation of that data source). We also discussed update
>> frequency as something that we would like to represent in RDF.
>
>
> See
> http://rdfs.org/ns/void
> http://www.w3.org/TR/void/
>
>
>
>> Does anybody know of a good way of representing periodicity in a generic
>> fashion (appropriate ontology/namespace)? Of course, just being able to
>> represent hourly, daily, weekly, monthly, annually and provide it to
>> software agents via SPARQL would be an improvement on having to ask around.
>> :)
>>
>> http://vocab.deri.ie/dady# ?
>
> there is also the RSS 1 module
> http://web.resource.org/rss/1.0/modules/syndication/
>
> sy:updatePeriod
> "Describes the period over which the channel format is updated. Acceptable
> values are: hourly, daily, weekly, monthly, yearly. If omitted, daily is
> assumed."
>
> btw, if you don't know it, http://lov.okfn.org/dataset/lov/ is a really
> handy vocabulary search engine.
>
> Best
>
> Keith
>
>
>> Cheers,
>> Scott
>>
>> --
>> M. Scott Marshall, PhD
>> MAASTRO clinic, http://www.maastro.nl/en/1/
>> http://eurecaproject.eu/
>> https://plus.google.com/u/0/114642613065018821852/posts
>> http://www.linkedin.com/pub/m-scott-marshall/5/464/a22
>>
>>
>> On Tue, Nov 20, 2012 at 4:49 PM, Sands Alden Fish <sands@mit.edu> wrote:
>>
>>> Yes, I'd be curious to know the update frequency as well.  This being
>>> from September, 2011, we'd be anticipating a new cut right now.
>>>
>>>
>>>
>>> On Nov 20, 2012, at 8:52 AM, Michael Hausenblas <
>>> michael.hausenblas@deri.org>
>>>  wrote:
>>>
>>> >
>>> >> What's the update frequency of this effort?
>>> >
>>> > AFAIK roughly once per year up to now but Richard would be the more
>>> competent person to provide you with an answer ;)
>>> >
>>> > Cheers,
>>> >          Michael
>>> >
>>> > --
>>> > Dr. Michael Hausenblas, Research Fellow
>>> > DERI - Digital Enterprise Research Institute
>>> > NUIG - National University of Ireland, Galway
>>> > Ireland, Europe
>>> > Tel.: +353 91 495730
>>> > http://mhausenblas.info/
>>> >
>>> > On 20 Nov 2012, at 13:48, Kingsley Idehen wrote:
>>> >
>>> >> On 11/20/12 7:59 AM, Michael Hausenblas wrote:
>>> >>>> I would like to ask you if you can give me the information, in
>>> linked open data project, which data sets makes reference to which data
>>> sets and how many links there are between them.
>>> >>> http://lod-cloud.net/state/
>>> >>
>>> >> Michael,
>>> >>
>>> >> What's the update frequency of this effort?
>>> >>
>>> >> Kingsley
>>> >>>
>>> >>>
>>> >>> Cheers,
>>> >>>        Michael
>>> >>>
>>> >>> --
>>> >>> Dr. Michael Hausenblas, Research Fellow
>>> >>> DERI - Digital Enterprise Research Institute
>>> >>> NUIG - National University of Ireland, Galway
>>> >>> Ireland, Europe
>>> >>> Tel.: +353 91 495730
>>> >>> http://mhausenblas.info/
>>> >>>
>>> >>> On 19 Nov 2012, at 15:42, Mary Koutraki wrote:
>>> >>>
>>> >>>> Dear all,
>>> >>>>
>>> >>>> I would like to ask you if you can give me the information, in
>>> linked open data project, which data sets makes reference to which data
>>> sets and how many links there are between them.
>>> >>>>
>>> >>>> Thank you in advance.
>>> >>>>
>>> >>>> --
>>> >>>> Mary Koutraki
>>> >>>> PhD Student on Semantic Web
>>> >>>> UVSQ - ETIS Lab
>>> >>>>
>>> >>>>
>>> >>>
>>> >>>
>>> >>>
>>> >>
>>> >>
>>> >> --
>>> >>
>>> >> Regards,
>>> >>
>>> >> Kingsley Idehen
>>> >> Founder & CEO
>>> >> OpenLink Software
>>> >> Company Web: http://www.openlinksw.com
>>> >> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
>>> >> Twitter/Identi.ca handle: @kidehen
>>> >> Google+ Profile: https://plus.google.com/112399767740508618350/about
>>> >> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>>> >>
>>> >>
>>> >>
>>> >>
>>> >>
>>> >
>>> >
>>>
>>
>


-- 
M. Scott Marshall, PhD
MAASTRO clinic, http://www.maastro.nl/en/1/
http://eurecaproject.eu/
https://plus.google.com/u/0/114642613065018821852/posts
http://www.linkedin.com/pub/m-scott-marshall/5/464/a22