[tdwg-content] practical details of recording a determination What is an Occurrence?

Richard Pyle deepreef at bishopmuseum.org
Thu Oct 21 09:11:33 CEST 2010

I see dwc:establishmentMeans as being very clearly a property of "Individual
At Place" (again, scoping "Individual" up to at least population).  The
closest thing we have to that in the diagram1 is Occurrence.  The only hitch
is that Occurrence isn't exactly "Individual At Place", so much as
"Individual At Event[=Place+Time]" Some people have suggected that
dwc:establishmentMeans is a function of Time as well as Place, in which case
it is very clearly (to me) a property of Occurrence.



	From: Steve Baskauf [mailto:steve.baskauf at vanderbilt.edu] 
	Sent: Wednesday, October 20, 2010 3:25 PM
	To: Richard Pyle
	Cc: tdwg-content at lists.tdwg.org
	Subject: Re: [tdwg-content] practical details of recording a
determination What is an Occurrence?
	Well, I also feel pretty good about most of that diagram, but I'm
still struggling with the whole "token" thing.  I feel the need to discuss
basisOfRecord=LivingSpecimen which is the most complicated case and is also
related to the previous discussion about dwc:establishmentMeans as well as
my proposal to move it to the proposed Individual class.  It is also related
to another issue that I haven't broached here but which is discussed in my
paper - "Occurrences" that aren't directly derived from an individual.  I'm
beginning to think that part of what I wrote there (in the paper) was wrong,
but I'm not sure what the alternative is.  That issue will probably come up
if I comment about what Cam wrote in his email.  So there may be more to
hash out, but I can't handle it today because I've got too many other things
to do.  I've been mentally composing what I hope is a lucid presentation,
but it hasn't hit the keyboard yet.

		I have to say, this has been about the most productive (if
		list-discussion I've had in...well...maybe ever.  It seems
we've both been
		equally persuasive, and equally willing to concede.  How
rare that happens
		in an internet forum!  I'm not sure there's anything left
that we disagee
		about.  If the "diagram1" seems to resonate with everyone as
the most
		"normalized" ER diagram we'll likely ever need, and if we
can somehow
		accommodate flexibility in RDF for collapsing attributes to
		classes (but only from the "one" side to the "many" side) --
then we might
		have achived the elusive Holy Grail of biodiversity
informatics: true

			Thanks for your great feedback and for challenging
my statements.  I need


	Steven J. Baskauf, Ph.D., Senior Lecturer
	Vanderbilt University Dept. of Biological Sciences
	postal mail address:
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