[redland-dev] contexts (was: ANNOUNCEMENT: Redland RDF Application Framework 0.9.12

[Danny Ayers]

Hi Dave,

Looking good!

When you have a spare minute(!), I for one would appreciate some expansion
on your description of contexts - how it relates to the M&T, and perhaps how
the same functionality might be added to other APIs (Jena ;-) etc.

(btw, I just got a new machine onto which I've put Debian, so am hoping to
have a proper play with Redland in the near future - I just couldn't face it
in this Windows environment, despite Cygwin)

Cheers,
Danny.
-----------

http://dannyayers.com

"The lyf so short, the craft so long to lerne." - Chaucer



>-----Original Message-----
>From: redland-dev-bounces at lists.librdf.org
>[mailto:redland-dev-bounces at lists.librdf.org]On Behalf Of Dave Beckett
>Sent: 13 February 2003 13:11
>To: redland-announce at lists.librdf.org
>Cc: redland at yahoogroups.com; redland-dev at lists.librdf.org
>Subject: [redland-dev] ANNOUNCEMENT: Redland RDF Application Framework
>0.9.12
>
>
>
>The long delayed :)  If I was counting major version numbers, this
>would be something like V2.  Roll on 0.9.13
>
>Dave
>
>
>	       Redland RDF Application Framework 0.9.12
>		http://www.redland.opensource.ac.uk/
>
>Redland is a C library that provides a high-level interface for RDF
>allowing the RDF graph to be parsed from XML, stored, queried and
>manipulated.  Redland implements each of the RDF concepts in its own
>class via an object based API, reflected into the other language APIs
>- Java, Perl, PHP, Python, Ruby and Tcl. Some of the classes
>providing the parsers, storage mechanisms and other elements are
>built as modules that can be added or removed as required.
>
>Redland 0.9.12 is a major release with many changes and improvements
>(last was 2002-06-08).  The main changes are as follows
>
>NEW FEATURES
> * Added contexts
>   Statements added to Model (when using a Storage that supports
>   contexts) can take an optional Node, returned by the new
>   get_context method on Iterator and Stream classes.
>
>   This is explained in greater detail in the full release notes:
>     http://www.redland.opensource.ac.uk/RELEASE.html#rel0_9_12
>
>
>FORMAT CHANGES
> * The persistent storage format was changed to support RDF typed
>   literals and this will require an upgrade of any existing
>   Berkeley/Sleepycat DB stores created by Redland 0.9.11 or
>   earlier. A utility redland-db-upgrade is provided that creates
>   an updated store from an existing one.
>
>API CHANGEs
> * Iterator and Stream classes.
>   The next/get_next method is split into get_object always
>   returning a shared object and next methods.  get_context method
>   added. (get_object is called current in higher level languaged APIs)
>
> * Model class.
>   Method add_statement no longer takes ownership of the passed in
>   statement. The caller now retains ownership.
>
>   Method add_statements no longer frees the passed in
>   librdf_stream; the caller must free it now.
>
> * Node and Model classes.
>   Added RDF Datatyped Literals. Other literal is_wf_xml
>   constructors and methods deprecated.
>
> * General
>   All literals methods and constructors have no mention of the
>   never-used or supported XML Space argument which hasis not part
>   of an RDF literal.
>
>OTHER CHANGES
>
> * Added a script utils/update-api-0912.pl to help automate the API
>   changes as far as possible or warn about those that cannot be
>   automatically updated.
>
> * Many portability and compiling fixes (OSX, gcc 3.x, FreeBSD,
>   non-gcc compiler)
>
> * Updated to Raptor version 0.9.8 (RDF/XML and N-Triples parser)
>
> * Java API classes. Add finished() method replacing useless
>   finalize().  Use Raptor message callbacks to get parser warnings
>   and errors.
>
> * Build Java API working around the stupid things recent SWIG
>   versions do.
>
> * Make Redland work with BDB/Sleepycat DB v4 (as well as v2 and v3).
>
> * Python API gains pydoc comments and HTML derived version.
>
> * Perl and Python APIs now receive Redland message callbacks.
>
> * Redland URI class now registers with Raptor rather than specially
>   compile Raptor.
>
> * Added RDF/XML Serializer class and made higher level language APIs
>   to it.
>
> * Update to Raptor version 0.9.8 (RDF/XML and N-Triples parser) -
>   see the Raptor NEWS at
>     http://www.redland.opensource.ac.uk/raptor/NEWS.html
>   for more detailed changes since 0.9.5.
>
> * Added skeleton Ruby and PHP APIs.
>
> * Major source reorganisation.
>
>See also the detailed 0.9.12 release notes at
>http://www.redland.opensource.ac.uk/RELEASE.html#rel0_9_12
>
>The release consists of the full sources, RPM binaries and SRPMS
>packages for RedHat Linux 7.3.  It is also available from the
>Redland SourceForge mirror site at http://sourceforge.net/projects/librdf/
>
>The main web site lets you browse and check out the latest version of
>the sources in CVS and use Redland in various demos.
>
>I post updates about Redland and Raptor to the redland-dev list
>which is one of the lists you can join from the list page at
>  http://www.redland.opensource.ac.uk/lists/
>
>Dave
>
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