Registration of media type application/sparql-query
eric at w3.org
Thu Nov 24 22:17:08 CET 2005
see also http://www.w3.org/TR/2005/WD-rdf-sparql-query-20051123/mime.txt
The syntax of the SPARQL Query Language is expressed over
code points in Unicode[UNICODE 3.0]. The encoding is always
Unicode code points may also be expressed using an \uXXXX (U+0 to
U+FFFF) or \UXXXXXXXX syntax (for U+10000 onwards) where X is a
hexadecimal digit [0-9A-F]
SPARQL queries using FROM, FROM NAMED, or GRAPH may cause the
specified URI to be dereferenced. This may cause additional use of
network, disk or CPU resources along with associated secondary issues
such as denial of service. The security issues of Uniform Resource
Identifier (URI): Generic Syntax [RFC3986] Section 7 should be
considered. In addition, the contents of file: URIs can in some cases
be accessed, processed and returned as results, providing unintended
access to local resources.
The SPARQL language permits extensions, which will have their own
Multiple IRIs may have the same appearance. Characters in different
scripts may look similar (a Cyrillic "o" may appear similar to a Latin
"o"). A character followed by combining characters may have the same
visual representation as another character (LATIN SMALL LETTER E
followed by COMBINING ACUTE ACCENT has the same visual representation
as LATIN SMALL LETTER E WITH ACUTE). Users of SPARQL must take care to
construct queries with IRIs that match the IRIs in the data. Further
information about matching of similar characters can be found in
Unicode Security Considerations [UNISEC] and Internationalized
Resource Identifiers (IRIs) [RFC3987] Section 8.
There are no known interoperability issues.
Applications which use this media type:
No known applications currently use this media type.
A SPARQL query may have the string 'PREFIX' (case independent) near
the beginning of the document.
The SPARQL 'BASE <IRIref>' term can change the current base URI for
relative IRIrefs in the query language that are used sequentially
later in the document.
Macintosh file type code(s):
Person & email address to contact for further information:
public-rdf-dawg-comments at w3.org
Restrictions on usage:
The SPARQL specification is a work product of the World Wide Web
Consortium's RDF Data Access Working Group. The W3C has change
control over these specifications.
[RFC3023] Murata, M., St. Laurent, S., and D. Kohn, "XML Media Types",
RFC 3023, January 2001.
[RFC3629] F. Yergeau, "UTF-8, a transformation format of ISO 10646",
RFC 3629, November 2003.
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66, RFC
3986, January 2005.
[RFC3987] Duerst, M. and M. Suignard, "Internationalized Resource
Identifiers (IRIs)", RFC 3987, January 2005.
[UNICODE3.0] "The Unicode Standard Version 3.0", Addison Wesley,
Reading, MA, ISBN 0-201-61633-5, August 2000.
[UNISEC] Mark Davis, Michel Suignard, "Unicode Security
office: +81.466.49.1170 W3C, Keio Research Institute at SFC,
Shonan Fujisawa Campus, Keio University,
5322 Endo, Fujisawa, Kanagawa 252-8520
+1.617.258.5741 NE43-344, MIT, Cambridge, MA 02144 USA
(eric at w3.org)
Feel free to forward this message to any list for any purpose other than
email address distribution.
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