- From: Andy Seaborne <andy.seaborne@epimorphics.com>
- Date: Wed, 18 Jul 2012 19:04:29 +0100
- To: RDF-WG <public-rdf-wg@w3.org>, SPARQL Working Group <public-rdf-dawg@w3.org>
The comment "Turtle: Prefixes now can contain colons (":")?" [1]
is a bug in the SPARQL grammar that got propagated to Turtle. By
putting the raw ':' in PN_CHARS_U, colons could appear in the prefix
part, blank node ids and, in SPARQL, variable names.
The fix is not put ':' in PN_CHARS_U but instead to write out PN_LOCAL
more fully. PN_LOCAL is the local part of a prefixed name.
So the difference between non-raw colon Turtle and SPARQL is confined
PN_LOCAL ::=
(PN_CHARS_U | ':' | [0-9] | PLX )
((PN_CHARS | '.' | ':' | PLX)* (PN_CHARS | ':' | PLX) )?
reverting the edits to PN_CHARS_U
Gavin has already incorporate this into the Turtle ED and it's in the
SPARQL Query ED.
Thanks to Mathias Hasselmann for pointing this out, along with the
details he presented.
Andy
[1]
http://lists.w3.org/Archives/Public/public-rdf-comments/2012Jul/0006.html
Received on Wednesday, 18 July 2012 18:05:02 UTC