Re: xsd:date in DCAT

Fadi, all,

Thank you for the pointer. The current wording is fine with me.

Best,
Stasinos


On Thu May 30 14:27:37 2013 Fadi Maali said:

> Hi,
> 
> Thanks for the feedback on DCAT!
> I want to let you know that I have changed the text in DCAT Spec as suggested by Phil
> see for example: https://dvcs.w3.org/hg/gld/raw-file/default/dcat/index.html#Property:dataset_release_date
> 
> Best regards,
> Fadi
> On 5 Apr 2013, at 08:33, Stasinos Konstantopoulos <konstant@iit.demokritos.gr> wrote:
> 
> > Dear Phil, GLDers,
> > 
> > kind reminder of some thoughts I had posted earlier, regarding ways to
> > compromise between current (mal)practice and accurate ways to express "I
> > don't know exactly when".
> > 
> > http://lists.w3.org/Archives/Public/public-gld-wg/2012Jan/0094.html
> > 
> > best,
> > s
> > 
> > 
> > On Thu Apr  4 10:16:49 2013 Phil Archer said:
> > 
> >> Having noted this afternoon's agenda item on ADMS I'm working on
> >> that document right now which is causing me to look at DCAT more
> >> carefully than I have of late - which is my excuse for just noticing
> >> something I should have seen before. I ask that the WG treats this
> >> as a last call comment.
> >> 
> >> In the text related to the use of dcterms:issued [1] we say:
> >> 
> >> "rdfs:Literal typed as xsd:date. The date is encoded as a literal in
> >> "YYYY-MM-DD" form (ISO 8601 Date and Time Formats). If the specific
> >> day or month are not known, then 01 should be specified."
> >> 
> >> I remember raising this at our previous f2f last year as I find it
> >> objectionable that we actively encourage sloppy practice and
> >> inaccurate data.
> >> 
> >> If I know that something was issued in March 2013 then I can write
> >> 
> >> dcterms:issued "2013-03"^^xsd:gYearMonth
> >> 
> >> That conveys exactly what I mean - that the thing was issued at some
> >> point between 2013-03-01T00:00:00 and 2013-03-31T23:59:59. But I
> >> don't know when. It is accurate, if not precise.
> >> 
> >> But DCAT says we shouldn't do this. We should render it as
> >> 2013-03-01 which means that the thing was issued sometime in the 24
> >> hour period known as 1st March. That may be wrong by as much as 30
> >> days and gives an entirely bogus impression of accuracy.
> >> 
> >> I suspect that the reason for this is that catalogues habitually
> >> don't understand xsd:gYearMonth. If that's the case then that's
> >> application-specific and a profile may wish to make it clear that
> >> dates must be xsd:date only, even if that means it will create
> >> inaccuracies where none exist in the original data, but IMHO this
> >> sloppiness should not be included in the DCAT spec. Therefore I
> >> suggest that the text for this property says:
> >> 
> >> "rdfs:Literal using the relevant ISO 8601 Date and Time compliant
> >> string and typed using the appropriate XML Schema datatype
> >> [[XMLSCHEMA-2]]"
> >> 
> >> [1] http://www.w3.org/TR/vocab-dcat/#Property:catalog_release_date

Received on Friday, 31 May 2013 06:48:11 UTC