Congratulations and thanks to David Bearman for a very
effective and succinct summary of the deliberations of
the Relation working group.
A few comments:
A. I would suggest that for the purposes of DC-Lite
one additional piece of information probably needs to
be stated explicitly so that people can see what
"Relation" is all about. The _second_ (?) simplest
versions of the Dublin Core Relation element will
normally require two attributes:
1. the relation type - as summarised by David;
2. identification of the related resource.
This has syntax implications.
(The _simplest_ version might only have the
identifier and dispense with the type ...)
B. Now that the intended use of Relation has been completed (!!??)
the role of DC-Source suggested originally I think by Doug Dodds
at Helsinki, and discussed a little further on meta2, can be
understood by comparison with (DC-Relation type=IsBasedOn).
DC-Source will often refer to the same related resource as
one identified through DC-Relation of this type,
with the special characteristics that
(i) the related resource may be several steps away
through a chain of "derivations",
(ii) the metadata for the related resource is judged to
be very important for resource discovery of the present
resource as well, and so can be embedded within the metadata
for the present resource with the qualifier DC-Source.
Thus, Kenneth Branagh's movie of Henry V
DC.Creator="Kenneth Branagh"
DC.Date="1994" (?)
could have metadata for the Shakespeare script embedded
within its metadata through use of DC-Source,
DC.Source.Creator="William Shakespeare"
DC.Source.Date="1605" (?)
while the link through DC-Relation would just
_identify_ the Shakespeare
DC.Relation=(Type=IsBasedOn,Identifier=theShakespeareScript)
(This illustrates the problems with the syntax for a Lite version.)
C. The User Guide for DC-Relation would be well served
through a bunch of examples for each of the types.
--
__________________________________________________
Dr Simon Cox - Australian Geodynamics Cooperative Research Centre
CSIRO Exploration & Mining, PO Box 437, Nedlands, WA 6009 Australia
T: +61 8 9389 8421 F: +61 8 9389 1906 [log in to unmask]
http://www.ned.dem.csiro.au/SimonCox/
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