[redland-announce] ANNOUNCEMENT: Rasqal RDF Query Library 0.9.21

[Dave Beckett]

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		   Rasqal RDF Query Library 0.9.21
		      http://librdf.org/rasqal/

Rasqal is a free software / Open Source C library that handles Resource
Description Framework (RDF) query language syntaxes, query construction
and execution of queries returning results as bindings, boolean, RDF
graphs/triples or syntaxes. The supported query languages are:
  SPARQL 1.0, RDQL, Draft SPARQL Query 1.1, Update 1.1 and
  Experimental SPARQL extensions (LAQRS).
Rasqal can write binding query results in the following formats:
  SPARQL XML, SPARQL JSON, CSV, TSV, HTML, ASCII tables and Turtle
and read them in SPARQL XML.

Rasqal is designed to work closely with the Redland[1] RDF library
and the Raptor[2] RDF Syntax Library but is entirely separate from both.

Rasqal is beta quality; the API is still changing and the SPARQL
support is under development.  It is a portable library and has been
tested on multiple POSIX systems and architectures.  Rasqal has no
known memory leaks.

The main changes in this version since the last release 2010-08-22 are:
 * Updated to handle aggregate expression execution as defined by the
   SPARQL 1.1 Query W3C working draft of 14 October 2010
 * Executes grouping of results: GROUP BY
 * Executes aggregate expressions: AVG, COUNT, GROUP_CONCAT, MAX, MIN,
   SAMPLE, SUM
 * Executes filtering of aggregate expressions: HAVING
 * Parses new syntax: BINDINGS, isNUMERIC(), MINUS, sub SELECT and SERVICE.
 * The syntax format for parsing data graphs at URIs can be explictly declared.
 * The roqet utility can execute queries over SPARQL HTTP Protocol and
   operate over data from stdin.
 * Added several new APIs
 * Fixed Issue: #0000388

For full details see the Rasqal 0.9.21 release notes at
  http://librdf.org/rasqal/RELEASE.html#rel0_9_21

Rasqal 0.9.21 requires Raptor 1.4.19[2] or newer to provide RDF, web,
XML and URI support.  Optional requirements are a POSIX regular
expression library such as PCRE or one built into the C library to
handle regex matching and a multi-precision decimal library such
as GNU MP or MPFR.

Binary deb packages for Debian unstable will be made available
later via the standard Debian archive.

The http://librdf.org/ site lets you browse and check out the latest
version of the sources in GIT and try out Rasqal (as part of Redland)
in a web demonstration at http://librdf.org/query and as part of
Triplr http://triplr.org/

For more information on Redland, Raptor or Rasqal please join
the redland-dev list by visiting http://librdf.org/lists/
or visit IRC channel #redland on irc.freenode.net

Issues should be reported to http://bugs.librdf.org/

Dave

[1] Redland RDF library,
http://librdf.org/

[2] Raptor RDF Syntax Library,
http://librdf.org/raptor/

[3] SPARQL 1.1 Query W3C Working Draft of 2010-10-14
http://www.w3.org/TR/2010/WD-sparql11-query-20101014/

[4] SPARQL 1.1 Update W3C Working Draft of 2010-10-14
http://www.w3.org/TR/2010/WD-sparql11-update-20101014/
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