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RE: (poll) renaming rdf:text to rdf:plainLiteral

From: Michael Schneider <schneid@fzi.de>
Date: Sat, 23 May 2009 15:46:59 +0200
Message-ID: <0EF30CAA69519C4CB91D01481AEA06A001413741@judith.fzi.de>
To: "Dave Reynolds" <der@hplb.hpl.hp.com>
Cc: <public-rif-wg@w3.org>, <public-owl-wg@w3.org>, "Sandro Hawke" <sandro@w3.org>
Dave Reynolds wrote:

>There also seemed to be a separate proposal to make the
>datatype-formerly-known-as-rdf:text be disjoint from xsd:string, i.e.
>only represent plain literals with language tags.
>Presumably by adopting the name "rdf:plainLiteral" we would be rejecting
>that other suggestion.

AFAICT, it keep things as they are. I believe, making rdf:text disjoint from
xsd:string would be a significant change of design, and would ask for
another Last Call. At least, it would require further spec'ing work by our
working groups.

Currently, §3 of "rdf:text" sais:

Value Space. The value space of rdf:text consists of

* all strings, and
* all pairs of the form ( "abc" , "lc-langtag" ) 
  where "abc" is a string and "lc-langtag" is a lowercase language tag.

So it covers the non-tagged plain literals ("all strings"). And there is
even an example for this in §3:
Lexical form: "Family Guy@"
Corresponding data value: "Family Guy"

But I don't see a problem with having rdf:text subsuming non-tagged plain
literals, since the subset of all language-tagged plain literals can easily
be referred to via the rdf:langRange facet:

Example from §3:
The pair ( rdf:langRange "*" ) is mapped to the subset of the value space of
rdf:text containing all pairs of the form ( "abc" , "lc-langtag" ). In
languages such as OWL 2, this can be used to specify that a data value must
contain the language tag.

So it's at least not a problem for OWL 2 to refer to this subset, in
particular since OWL 2 now has datatype definitions, which allows for
assigning a name to a facet-restricted datatype. I don't know what the
situation is for RIF, though.

>OK with me either way, the separation proposal had some slight appeal to
>me but it's no big deal, just wanted to clear that's what's being


Dipl.-Inform. Michael Schneider
Research Scientist, Dept. Information Process Engineering (IPE)
Tel  : +49-721-9654-726
Fax  : +49-721-9654-727
Email: michael.schneider@fzi.de
WWW  : http://www.fzi.de/michael.schneider
FZI Forschungszentrum Informatik an der Universität Karlsruhe
Haid-und-Neu-Str. 10-14, D-76131 Karlsruhe
Tel.: +49-721-9654-0, Fax: +49-721-9654-959
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Vorstand: Prof. Dr.-Ing. Rüdiger Dillmann, Dipl. Wi.-Ing. Michael Flor,
Prof. Dr. Dr. h.c. Wolffried Stucky, Prof. Dr. Rudi Studer
Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus

Received on Saturday, 23 May 2009 13:47:40 UTC

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