At some point we should consider integrating examples in the Darwin Core repository (it's new home) on Github (https://github.com/tdwg/dwc). If you agree, we should use the new reference in the RDF Guide. I have created an issue for this (https://github.com/tdwg/dwc/issues/52).
On Sat, Dec 13, 2014 at 1:49 PM, Steve Baskauf <steve.baskauf@vanderbilt.edu
wrote:
Umm. I don't understand why what you said is relevant. Nobody that I know of has assigned domains to any of the existing Darwin Core terms. If you have Darwin-SW in mind, it only assigns domains to object properties that it mints and I don't see how that would prevent supporting either or both kinds of use. The problem in my mind is figuring out how to do queries that would catch both kinds of uses, e.g.
SELECT ?Occurrence WHERE { ?Occurrence dwc:eventDate "2014-12-13"^^xsd:date. ?Occurrence dwc:locality "Smith Pond". }
which would work for the simple version, but not Darwin-SW. Obviously, one could easily create a more complex query that would work in simple cases like this example, but the complexity would expand greatly if one wanted to require matches with 3 or more patterns. Steve
Bob Morris wrote:
Ah, Steve, your examples well illustrate the reason to avoid assigning rdfs:domain, as well as why both are perfectly good illustrations neither of which should be deprecated. Communities of practice can exploit either or both, and the only communities that are nailed are those that labor under an rdfs:domain for such things as dwc:EventDate
Bob
On Fri, Dec 12, 2014 at 10:59 PM, Steve Baskaufsteve.baskauf@vanderbilt.edu steve.baskauf@vanderbilt.edu wrote:
Paul, That's exciting that you are trying to generate RDF using real data!
I think we initially considered including something in the guide like what you have suggested, but the problem is that what constitutes "an Occurrence record" varies depending on the model one has in mind when serializing the record as RDF. Historically, "occurrences" were considered to be a superclass that included specimens, and any property remotely related to a specimen could be included as part of an occurrence record. A provider exposing an occurrence record might give it properties such as dwc:eventDate, dwc:preparations, and dwc:locality. However, a different provider might consider dwc:eventDate to be the property of a dwc:Event instance, dwc:preparations to be the property of a dwc:PreservedSpecimen, and dwc:locality to be the property of a dcterms:Location instance and link those instances to a separate Occurrence instance via object properties.
Which of these is correct? At this point there is no consensus as to whether one of these approaches is better than the other. We avoided putting extensive examples within the guide document itself, since the guide will become part of the standard and will probably not be changed frequently, whereas best practices for deciding the types of resources with which properties should be associated is likely to develop over time and with the experience of usage. For that reason, we have included examples in the ancillary documents that are associated with the guide, but which do not form part of the standard. The "examples using 'pure' Darwin Core" [1] and "Examples using Darwin-SW object properties" [2] illustrate the extremes that I've described above.
Steve
[1] https://code.google.com/p/tdwg-rdf/wiki/DwcRdfOccurrences [2] https://code.google.com/p/tdwg-rdf/wiki/DwcRdfExamplesDarwinSW
Paul J. Morris wrote:
As I've been working through implementing RDF generation in a few applications and seeking to conform to the guide, I've found myself spending a good bit of time hunting through the document looking for guidance on particular situations, this leads me to a suggestion for the guide: Include, at the end of the guide, a single comprehensive example of an Occurrence record, annotated to point to relevant sections in the guide. This could serve both to quickly answer questions and as a visual index to the rest of the guide.
-Paul
-- Steven J. Baskauf, Ph.D., Senior Lecturer Vanderbilt University Dept. of Biological Sciences
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-- Steven J. Baskauf, Ph.D., Senior Lecturer Vanderbilt University Dept. of Biological Sciences
postal mail address: PMB 351634 Nashville, TN 37235-1634, U.S.A.
delivery address: 2125 Stevenson Center 1161 21st Ave., S. Nashville, TN 37235
office: 2128 Stevenson Center phone: (615) 343-4582, fax: (615) 322-4942 If you fax, please phone or email so that I will know to look for it.http://bioimages.vanderbilt.eduhttp://vanderbilt.edu/trees
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