- From: Andy Seaborne <andy.seaborne@epimorphics.com>
- Date: Wed, 01 May 2013 13:05:07 +0100
- To: Eric Prud'hommeaux <eric@w3.org>
- CC: public-rdf-wg@w3.org
On 01/05/13 12:48, Eric Prud'hommeaux wrote: > * Andy Seaborne <andy.seaborne@epimorphics.com> [2013-05-01 10:19+0100] >> gedit complains about (but displays) the attachment. >> >> On 01/05/13 05:52, Eric Prud'hommeaux wrote: >>> I've noticed 6 vectors for creating literals with C0 codes >>> (including \0): >>> old turtle >>> APIs >>> SPARQL CONSTRUCT >>> SPARQL Update >>> RDBs via Direct Mapping >>> RDBs via R2RML >>> (RDB example reproducable with >>> create table test(s text); >>> insert into test (s) values ('a\0b'); >>> select s, length(s) from test; >>> +------+-----------+ >>> | s | length(s) | >>> +------+-----------+ >>> | | 1 | >>> | a b | 3 | >>> +------+-----------+ >> >> ? where did the first row come from? > > MySQL's D-entailment. ˚͜˚ > My first insert was '\0\, but i figured that 'a\0b' would be more > illustrative. > > >>> ). >>> >>> These can't be serialized in RDF/XML. Nor can the results of a query >>> including this data be serialized in application/sparql-results, e.g. >> >> application/sparql-results+xml > > quite right -- tx for the correction. > > >> There is also >> >> application/sparql-results+json >> text/tab-separated-values TSV says http://www.iana.org/assignments/media-types/text/tab-separated-values """ Required Parameters: Character Set, Encoding Type """ I avoided CVS as it is not a true representation of the data but ... > Does text/csv permit *anything* outside of > %x20-21 / %x23-2B / %x2D-7E / COMMA / CR / LF / 2DQUOTE ? > — http://tools.ietf.org/html/rfc4180#page-4 RFC 4180 says: """ Common usage of CSV is US-ASCII, but other character sets defined by IANA for the "text" tree may be used in conjunction with the "charset" parameter. """ so UTF-8 is possible. > > >> JSON allows \u0000 - RFC 4627 refers to Unicode 4.0 >> >> >>> SELECT ?icon { ?who <p> ?icon FILTER (regex(?icon, "PNG")) } >>> They can, however, be queried in SPARQL: >>> SELECT ?who { ?who <p> ?icon FILTER (regex(?icon, "PNG")) } >>> (Technically, useful functions like fn:regex are based on strings, but >>> I don't know of implementations which enforce this.) >>> >>> In theory, existing turtle files like the attached are rendered >>> illegal by the post-facto declaration that they are xs:strings. >>> In practice, people don't enforce this (noting that these tests >>> existed for a while in Turtle with no one failing or crying fowl.) >>> >> >
Received on Wednesday, 1 May 2013 12:06:12 UTC