On Nov 27, 2013, at 8:07 PM, John McClure <jmcclure@xxxxxxxxxxxxxx> wrote: (01)
> On 11/24/2013 10:23 AM, Simon Spero wrote
> [I just noticed that there is no property defined on Statement for the
> fourth part of the quad, which seems odd given the new concrete syntax
> for quads, and the intended relationship of reified statements to a
> statement made in a document in a concrete syntax. I can think of
> arguments against, but nothing is mentioned in the new specs. ]
>
> Where can I find more information about the fourth part of the quad. I'm
> assuming that's to point to a provenance object defined by the PROV
> standard (02)
That assumption illustrates the basic problem: there is no way to standardize
the multifarous potential uses for the fourth quad field. To my knowledge it
has been used as a graph label, as an extra relational parameter, to encode a
time reference, to indicate a source (but not using PROV: that usage pre-dates
PROV by several years, maybe a decade), and simply as an indexing mechanism
inside a quad store. I am sure that there are others. So, implementations use
it (and some even use quints) but its not part of any normative RDF standard
because it doesn't have a coherent semantics. (03)
Pat (04)
> , but it's nice to know a quad is being standardized.e
>
> _________________________________________________________________
> Message Archives: http://ontolog.cim3.net/forum/ontolog-forum/
> Config Subscr: http://ontolog.cim3.net/mailman/listinfo/ontolog-forum/
> Unsubscribe: mailto:ontolog-forum-leave@xxxxxxxxxxxxxxxx
> Shared Files: http://ontolog.cim3.net/file/
> Community Wiki: http://ontolog.cim3.net/wiki/
> To join: http://ontolog.cim3.net/cgi-bin/wiki.pl?WikiHomePage#nid1J
>
> (05)
------------------------------------------------------------
IHMC (850)434 8903 home
40 South Alcaniz St. (850)202 4416 office
Pensacola (850)202 4440 fax
FL 32502 (850)291 0667 mobile (preferred)
phayes@xxxxxxx http://www.ihmc.us/users/phayes (06)
_________________________________________________________________
Message Archives: http://ontolog.cim3.net/forum/ontolog-forum/
Config Subscr: http://ontolog.cim3.net/mailman/listinfo/ontolog-forum/
Unsubscribe: mailto:ontolog-forum-leave@xxxxxxxxxxxxxxxx
Shared Files: http://ontolog.cim3.net/file/
Community Wiki: http://ontolog.cim3.net/wiki/
To join: http://ontolog.cim3.net/cgi-bin/wiki.pl?WikiHomePage#nid1J (07)
|