[redland-dev] ANNOUNCEMENT: Rasqal RDF Query Library 0.9.27

[Dave Beckett]

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		   Rasqal RDF Query Library 0.9.27
		      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[3], Update 1.1[4] and
  Experimental SPARQL extensions (LAQRS).
Rasqal can write binding query results in the following formats:
  SPARQL XML, SPARQL JSON, CSV, TSV, HTML, ASCII tables, RDF/XML and
  Turtle / N3
and read them in SPARQL XML, RDF/XML and Turtle / N3.

Rasqal is designed to work closely with the Redland librdf[1] RDF API
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 2011-06-27 are:
 * sub-SELECTs can now be executed
 * OPTIONAL and UNION fully execute correctly
 * Grouping over sub-graph patterns fully executes correctly
 * CONSTRUCT WHERE abbreviation is supported and executes
 * CONSTRUCT works when working over a query with optionals
 * Updated the CSV and TSV outputs to match the editor's draft SPARQL 1.1
   Query Results CSV and TSV Formats[5]
 * Made other fixes and improvements including fixing reported Issues:
   0000127, 0000423, 0000434, 0000454 and 0000459.

For full details see the Rasqal 0.9.27 release notes at
  http://librdf.org/rasqal/RELEASE.html#rel0_9_27

The Rasqal API reference manual section on API changes at
http://librdf.org/rasqal/docs/api/raptor-changes.html provides
detailed function, enum, macro and type changes.

Rasqal 0.9.27 requires Raptor 2.0.4[2] or newer to provide RDF
syntax, 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 for handling XSD decimals.

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 librdf RDF API library,
http://librdf.org/

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

[3] SPARQL 1.1 Query W3C Working Draft of 2011-05-12
http://www.w3.org/TR/2011/WD-sparql11-query-20110512/

[4] SPARQL 1.1 Update W3C Working Draft of 2011-05-12
http://www.w3.org/TR/2011/WD-sparql11-update-20110512/

[5] SPARQL 1.1 Query Results CSV and TSV Formats W3C editor's draft
http://www.w3.org/2009/sparql/docs/csv-tsv-results/results-csv-tsv.html
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