Hi Hilmar,
I'm not yet convinced that dwc:establishmentMeans is not meaningful for a point (which I interpret as a single organism or small set of organisms collected or observed at a particular place/time). I think a legitimate piece of metadata (i.e., something that data consumers will often want to know) for such "standard" occurrence record is: "Was this organism born in the general vicinity of its documented capture/observation, or did it arrive from a far-distant locality during its lifetime?" And, if the answer is the latter, then many data consumers may also want to know "Was it brought by humans to its documented place & time, or did it manage to get there by so-called 'natural' means?" Also, if the organism itself was born in the vicinity of its documented capture/observation, it may be useful to know whether its recent ancestors arrived in the vicinity with or without the help of humans.
These seem like esoteric (or even rediculous) questions, but I think they are, in essence, what people want to know in terms of why establishmentMeans is part of DwC.
Also, as I tried to explain in one of my previous posts, it seems to me that an "Occurrence" ultimately represents "a tuple of (taxon concept, location, time)", where location and time are generally properties of Events, and an Occurrence is essentially the intersection of a Taxon Concept and an Event.
Aloha, Rich
-----Original Message----- From: Hilmar Lapp [mailto:hlapp@nescent.org] Sent: Tuesday, October 12, 2010 1:26 PM To: Richard Pyle Cc: Jerry Cooper; tdwg-content@lists.tdwg.org; tdwg-bioblitz@googlegroups.com Subject: Re: [tdwg-content] What I learned at the TechnoBioBlitz
Just trying to confirm whether my understanding from this thread so far is correct. Is there agreement that dwc:establishmentMeans is a) not meaningful for a point or region in space, or a point in time, or a taxon concept, but only for a taxon concept at a spatial location at a point in time, and b) is a judgment made by someone on the basis of certain evidence.
If yes, doesn't that mean that the property needs to be applied to a tuple of (taxon concept, location, time), and needs to be linked to a source and at least the kind of evidence (such as a vocabulary term) on which the judgement was made? I.e., how much worth is a dwc:establishmentMeans value that fails either of those requirements?
Apologies if that's all there already.
-hilmar
Sent with a tap.=