Someone has asked, on the RDF Syntax WG list, for a summary of what exactly
a "scheme" is meant to signify (in the DC context). I'd like your help in
answering this question. For the moment, I've sent the following rambling
description to the RDF Syntax WG list:
---
I'll try to do this when I find a spare half hour. For the moment, I'll
just say that some schemes (as the word is used in the DC context) are what
some people on the RDF list have been calling units. Others refer to
controlled vocabularies. Such vocabularies may use primarily numerical
node IDs, eg ISBN or UDC (aka DDC). Others use textual node IDs, eg AAT.
In some cases, more than one scheme may be in use at the same time. The
only examples I can think of right now are in the class of what you would
probably call units. For example, I could be using kilograms and decimal
notation or kilograms and scientific notation.
Other examples are:
- dates (eg ISO 8601)
- names (eg <FamilyName> "," <GivenName>)
- the DC:Coverage element
Lots of scheme examples for DC:Coverage may be seen at:
<http://www.sdc.ucsb.edu/~mary/coverage.htm#Schemes>. I quote:
Apart from specifying how the data is expressed (e.g., "DMS" for
degrees-minutes-seconds; "DD" for decimal degrees; "text" for text), the
geodetic datum (e.g., WGS84, NAD83, NAD27 CONUS, etc.) should be given
when it is known.
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