There is no such thing as rft.identifier.
There is an rft_id -- it's with the underscore, not a period, because
it's not a data element in a _particular_ OpenURL format, rather it
applies to any OpenURL format.
rft_id can be set to any URI (although that URI does need to be itself
URI-encoded, confusingly). Typical uses are for an OCLC number or an
I use rft_id to represent my own local accession numbers. First I
represent them as a URI: http://catalog.library.jhu.edu/10001.
Then you need to URI-encode that to put it in the KEV OpenURL such as is
the basis of COinS:
That's probably the best solution you are going to get out of
OpenURL/COinS. Yes, it is annoying in a few different ways.
Chris Catalfo wrote:
> Hi all,
> I am trying to find the best way to include an item's accession number (i.e.
> ILS system id) in a COiNS span. This is in the context of library catalog
> pages where I'd like to be able to retrieve the ILS accession number to
> return to LibraryThing for Libraries.
> I see no mention of an rft.identifier key/value pair on the COiNS site's
> brief guide to books . It does, however, appear as an element in the
> COiNS online generator for generic items .
> Googling returned a couple of results using rft.identifier to hold urls.
> Can anyone enlighten me as to whether using rft.identifier to hold the ILS
> accession number is valid? Or suggest a more suitable key/value pair?
> Thanks for any help you can provide.
> Chris Catalfo
> Programmer, LibraryThing
>  http://ocoins.info/cobgbook.html
>  http://generator.ocoins.info/?sitePage=info/dc.html&