Simon Cox wrote:
>A couple of comments regarding the proposal for semantics
>for DC.Coverage [http://www.sdc.ucsb.edu/~mary/coverage.htm] :
>
>1. In Helsinki it was agreed that the syntax for DC.Time
>should be revised to include the possiblity of
>(i) various forms of time-spans, including disjoint spans, and
>(ii) fuzzy times.
>It was commented that this syntax (when complete) should also be
>transfered to DC.Coverage - logically being used also for spatial
>extent when a "bounding box" style of extent is being specified.
>
I won't go into the 3d stuff - other than to ask if some one is
going to set up search routines for these. If not, I see no reason
for having them!
Re Time
DC.Coverage.t
time spans and disjoints can be handled the same as spatial discontinuities,
etc.
DC.Coverage.t.min
DC.Coverage.t.max
for start and end times etc.
DC.Coverage.t1.min
DC.Coverage.t1.max
DC.Coverage.t2.min
DC.Coverage.t2.max
etc.
fuzzies may have to be handled as text (ca.1922, 1920s, 20th Century, etc.)
a searching nighmare of course!
We have used it for searching for metadata (but not yet Dublin Core)
see http://www.environment.gov.au/
This will be hooked into Dublin Core before long.
regards
arthur
________________________________________________________________________________
Arthur D. Chapman [Scientific Coordinator, Biodiversity & Vegetationn, ERIN]
Environmental Resources Information Network internet: [log in to unmask]
GPO Box 787, Canberra, voice: +61-2-6274 1066
ACT 2601, AUSTRALIA fax: +61-2-6274 1333
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