[tdwg-content] DwC Occurrence [SEC=UNCLASSIFIED]

Tue May 31 22:02:54 CEST 2011

I'm glad to see this conversation re-vitalized, as we (Rob Whitton & I) have
been thinking a lot about this in our recent discussions concerning
BiSciCol, GNUB, etc.  I'm on coffee break from virtual attendance at a
conference right now, so no time to elaborate, except I think it would be
dangerous to accommodate an occurrence as a "species" (or any taxon concept)
at a place/time.  I know there are plenty of data that effectively are
represented as Taxon-at-Event (i.e., occurrence of a taxon at a place and
time).  However, I think these should all be framed as
"Individual-at-Event", even if "Individual" is nothing more than a GUID to
which Taxon identifications can be linked.

I think the hardest part will be to define the allowable scope of
"Individual".  In my mind, it should at least span from single organism to
multiple organisms up to colony and population; and can be circumscribed by
any taxon concept (including "Life").  I have been re-thinking whether
"part" should be treated as a separate individual.  I used to think yes, but
lately I've been thinking no.

Aloha,

Rich

From: tdwg-content-bounces at lists.tdwg.org
[mailto:tdwg-content-bounces at lists.tdwg.org] On Behalf Of Peter DeVries
Sent: Tuesday, May 31, 2011 9:24 AM
To: Nico Cellinese
Cc: tdwg-content at lists.tdwg.org List; Paul Murray
Subject: Re: [tdwg-content] DwC Occurrence [SEC=UNCLASSIFIED]

Hi Nico, 

Wouldn't the individual be asserted to be an instance of a species "concept"

For instance:

The species concept http://lod.taxonconcept.org/ses/ICmLC#Species

An individual of that species concept
http://lod.taxonconcept.org/ses/ICmLC#Individual

An occurrence that has been asserted to be an occurrence of that species
http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Occurre
nce

Which is documented by this page
http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9.html

Relationships between these entities can be browsed via the Knowledge Base
view.

<
http://lsd.taxonconcept.org/describe/?url=http://ocs.taxonconcept.org/ocs/f5
22444a-2dd9-400e-be59-47213ef38cb9%23Occurrence >

bit.ly http://bit.ly/jgRUxv

* Note that links on the HTML page will also take you to the views of the
different entities in the Knowledge Base.

Also note that someone else could assert that the individual butterfly is
actually an instance of a different species concept. One could simply
replace these assertions with their own in a separate mapping file, or

with a different predicate. Note the hypothetical links below don't work.

The individual
http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Individ
ual

<http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Indivi
dual> <bioimages:individualHasStevesSpeciesConcept>
<http://lod.bioimages.org/ses/123123#Species>

* We might miss some species occurrence records when we do this, so it would
be best to avoid creating a number of basically duplicate concepts
especially if they not the same "kind" of concept.

  For instance those that are linked to a specific name or classification
hierarchy.

Respectfully,

- Pete

On Tue, May 31, 2011 at 6:10 AM, Nico Cellinese <ncellinese at flmnh.ufl.edu>
wrote:

I personally like this nicely refined suggestion but to be honest, I can
also live with the others previously made.  What I don't seem to be able to
digest is the notion that same individual will later be equaled  by some to
a species. That assertion is hard to swallow.

Nico

On May 31, 2011, at 3:44 AM, Paul Murray wrote:

> An Occurrence is a combination of an Individual and an Event.
> An Occurrence is a coupling of an Individual and an Event.
> An Occurrence is a pairing of an Individual and an Event.

How about:

An Occurrence is the reification of an individual's involvement in
(entaglement with? presence at? relationship to?) an event. It reifies an
"Event involvesIndividual Individual" fact.

The need for this construct is that we often need to say a number of
additional things about an individual's involvement with (presence at) an
event beyond simply assertin that there is some relationship. We need to say
what tokens that individual left, what role that individual had (Predator?
Prey? Parasite?), perhaps temporal or other limits of that particular
individual at the event. Occurrence is the object to which these facts may
be attached. An individual might meaningfully have more than one occurrence
at an event - particularly in cases where events are part-of larger events,
or where an individual somehow has multiple roles (hyenas chased away from
their kill by a lion - or is it the other way around?).

To put it another way: "reification" = "tuple" = "association table" =
"pulling a property out into an object". More or less.

To put it another another way, an Occurence object stands in relation to an
event and an individual much as a TaxonRelationship object stands in
relation to the two taxa it mentions. You could simply model taxonomy with a
"hasSubtaxon" predicate, but we usually need to say a great deal more about
taxonomic relationships than that.

If you have received this transmission in error please notify us immediately
by return e-mail and delete all copies. If this e-mail or any attachments
have been sent to you in error, that error does not constitute waiver of any
confidentiality, privilege or copyright in respect of information in the
e-mail or attachments. Please consider the environment before printing this
email.

_______________________________________________
tdwg-content mailing list
tdwg-content at lists.tdwg.org
http://lists.tdwg.org/mailman/listinfo/tdwg-content

_______________________________________________
tdwg-content mailing list
tdwg-content at lists.tdwg.org
http://lists.tdwg.org/mailman/listinfo/tdwg-content

-- 
----------------------------------------------------------------------------
--------
Pete DeVries
Department of Entomology
University of Wisconsin - Madison
445 Russell Laboratories
1630 Linden Drive
Madison, WI 53706
Email: pdevries at wisc.edu
TaxonConcept <http://www.taxonconcept.org/>   &  GeoSpecies
<http://about.geospecies.org/>  Knowledge Bases
A Semantic Web, Linked Open Data <http://linkeddata.org/>   Project
----------------------------------------------------------------------------
----------

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.tdwg.org/pipermail/tdwg-content/attachments/20110531/d026b42f/attachment.html 