Authoritative use of dc:coverage?

["wkearney99" <wkearney99@hotmail.com>]

Hi all,

Can anyone offer some examples of 'authoritative' use of the dc:coverage
element from Dublin Core?
http://dublincore.org/documents/dces/

Element: Coverage
  Name:        Coverage
  Identifier:  Coverage
  Definition:  The extent or scope of the content of the resource.
  Comment:     Coverage will typically include spatial location (a place
name
               or geographic coordinates), temporal period (a period label,
               date, or date range) or jurisdiction (such as a named
               administrative entity).

               Recommended best practice is to select a value from a
               controlled vocabulary (for example, the Thesaurus of
Geographic
               Names [TGN]) and that, where appropriate, named places or
time
               periods be used in preference to numeric identifiers such as
               sets of coordinates or date ranges.

I'm most curious as to what you're supposed to be putting here as the value
and how you're supposed to indicate the 'controlled vocabulary'.

Why am I asking this?  Because I'm wondering what format a feed might use if
it wanted to indicate it's geographic location.  Using city names is one way
but likely to be fairly inaccurate.  Using latitude/longitide is more
accurate.  One doesn't have to use a precise lat/lon coordinate if there's
some concerns about privacy, security or whatever.  The coordinates of one's
local post office might be just as useful.  The point being to be able to
find feeds based on more than just content.  I'd like to know who's 'near' a
given location.  Perhaps for travel or just to get to know my neighbors.

Thanks,

Bill Kearney