Changelog:
- Folded the RDF DB, RDF Export and RDF Import submodules back into the base module to allow for easier dependency management.
- Updated menu routing for Drupal 6.2 compatibility (#264076).
- Disabled unavailable formats when ARC2 is not installed.
- Updated documentation; added sponsors to README.txt.

Changelog (RDF API):
- Fixed bug in _rdf_deconstruct_arc2_value().
- Accept both normalized and denormalized data in theming functions.
- Removed unnecessary 'Persistent' column from repository management screen.
- Fixed bug in theme_rdf_property_table().
- Implemented new API function rdf_value().
- Added new class RDF_Statement (needed by SPARQL module).
- Implemented to_n3() functions for RDF classes.

Changelog (RDF DB):
- Reorganized menu paths for RDF DB repository management in order to enable other modules to provide their own kinds of repositories.

Changelog (RDF Schema):
- Identified the forms that should eventually be extended using hook_form_alter().
- Implemented form extensions for node type and taxonomy vocabulary RDF mappings.
- Implemented form extensions for user profile field RDF mapping.

Changelog (RDF API):
- Added a new API convenience function rdf_mailto().
- Obsoleted hook_rdf_data() in favor of hook_rdf_resources().
- Reimplemented the system hook_rdf_query() for better memory-efficiency.
- Moved site description metadata to rdf_load_site().
- Updated module descriptions in README.txt to reflect .info files.

Changelog (RDF API):
- Renamed rdf_define_namespace() to rdf_define_vocabulary().
- Implemented a new class RDF_Variable and new API functions rdf_var() and rdf_is_var() for use e.g. with the SPARQL API.
- Renamed rdf_convert_arc2_triple() to _rdf_deconstruct_arc2_triple() and improved the function to handle more cases.
- Allowed explicit bnode identifier argument in rdf_bnode().

Changelog (RDF Import):
- Updated to use _rdf_deconstruct_arc2_triple().

Changelog (RDF API):
- Implemented hook_hook_info(), defining triggers that fire when triples are inserted or deleted.
- Implemented automatically-constructed namespace helper classes.
- Updated handbook link to point to http://drupal.org/handbook/modules/rdf.
- Implemented hook_rdf_contexts() and the corresponding new API function rdf_get_contexts().
- Implemented admin screen for viewing the available contexts (named graphs); added a new API function rdf_count().

Changelog (RDF DB):
- Implemented hook_rdf_contexts().

Changelog:
- Minor bug fixes to rdf_datetime(), rdf_select_predicates() and rdf_select_values().

Changelog:
- Implemented rdf_use_repository() and limiting of queries and operations to a particular repository.
- Implemented named graph support; fixed bug in rdf_delete() callback.
- #221284 by Arancaytar: Rename rdf_filter() to _rdf_filter() to avoid collision with hook_filter().

Changelog:
- Made site's dc:title a language-tagged literal.
- Implemented new API convenience functions rdf_insert_all() and rdf_datetime().
- Added stub for new API function rdf_use_repository().

Changelog:
- Imported INSTALL.txt.
- Set module weight to -10 to ensure API functions are loaded before submodules attempt to use them.
- Added triggers for hook_rdf('insert') and hook_rdf('delete').
- Added an API function for adding RDF auto-discovery headers.
- Added filtering parameters to rdf_get_repositories().
- Added function for converting triples from the RDF API to the equivalent ARC2 data structure.
- Miscellaneous minor bug fixes.

Changelog:
- Amended hook_rdf_formats() definitions with links to the RDF formats' specifications.
- Added some preliminary help texts for all admin screens based on the documentation at http://drupal.org/node/219852.
- Implemented hook_requirements('runtime') in order to display ARC2 installation status.

Changelog:
- Implemented a new setting for selecting the default serialization format.
- Added vendor directory for third-party code such as ARC2.
- Automatically load the ARC2 library in hook_init(), if it has been installed into vendor/arc2/ by the administrator.
- Implemented the RDF/JSON format and made it the default.
- Changed RDF/PHP format MIME type to application/vnd.php.serialized.
- Implemented hook_service() to integrate with the Services API.

These are part of an ensemble of modules providing comprehensive RDF functionality and interoperability for Drupal.

This is currently pre-alpha and should be considered an early development sneak peek for developers needing to introduce the RDF API as a dependency.