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[log in to unmask] wrote:
> 
> What's the down side of letting DC point to off-line resources (i.e.
> resources that aren't digitized)  

There is no real downside.  
Here's an extended example 
(based on data that I have to hand ...)


DC.Title="Simon Cox"
DC.Identifier="051-66-9762" (scheme="US SSN")
DC.Identifier="154 953 534" (scheme="Australian Tax File Number")
DC.Type="physical object"
DC.Format="Male 68kg 1.76m"
DC.Creator="Thelma Cox" (role="mother")
DC.Creator="Phillip Cox" (role="father")
DC.Date="1959-01-16"
DC.Subject="person"
DC.Description="Simon Cox is a scientist with CSIRO Australia.  
Favorite AFL team = St Kilda.  Brother = Richard.  Sister = Sarah."

(I thought about whether I could get my brother and sister 
(and even my employer!) into DC.Relation elements but none 
of the list of relation type seemed right!, so I used 
DC.Description.  This illustrates the fact that 
DC.Description - a free-text field - can be used to store 
any additional information that does not fit happily in more 
structured elements.)  

DC.Title="Simon Cox"
DC.Identifier="Image 39 of APS film 345-987"
DC.Type="image"
DC.Format="colour photograph"
DC.Creator="Steve Brown" (Role="photographer")
DC.Date="1997-09-07"
DC.Subject="person,tractor"
DC.Description="Photograph of Simon Cox on Steve Brown's tractor in Vermont, September 1997"
DC.Relation="IsBasedOn Simon Cox the person SSN=051-66-9762"

(The identifier and date might strictly be incorrect, 
but you get the idea.)

DC.Title="Simon Cox"
DC.Identifier="http://www.ned.dem.csiro.au/SimonCox/gallery/tractor.simon.jpg"
DC.Type="image"
DC.Format="image/jpeg 24kB 309x336 pixels"
DC.Contributor="Simon Cox" (Role="processor")
DC.Date="1997-12-28"
DC.Subject="person,tractor"
DC.Description="Scanned image of photograph of Simon Cox on Steve Brown's tractor in Vermont, September 1997"
DC.Relation="IsFormatOf Image 39 of APS film 345-987"

DC.Title="About Simon Cox"
DC.Identifier="http://www.ned.dem.csiro.au/SimonCox/"
DC.Type="text"
DC.Format="text/html 4701B"
DC.Creator="Simon Cox" 
DC.Date="1998-05-29"
DC.Subject="person,professional activities"
DC.Description="Web page about Simon Cox"
DC.Relation="IsBasedOn Simon Cox the person SSN=051-66-9762"

-- 
__________________________________________________
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/