Changelog:
- Implemented a proper database schema with a dedicated SQL table, and assorted schema migrations, for SPARQL node data.
- Improved error handling and caching logic for node-based queries.
- Implemented hook_delete() and hook_nodeapi() revision deletion.
- Added more MIME types for SPARQL resultset parsing (they are incorrect, but occasionally encountered in the wild).
- Made specifying the endpoint field mandatory until the Drupal-native engine is ready for prime time.
- Implemented more human-friendly display of query results (requires RDF API 6.x-1.0-alpha2).
- Added note about suppressing the display of previous query results when previewing a changed query.
- Implemented unit tests for querying the CIA Factbook's SPARQL endpoint.

Changelog:
- Update menu handling for Drupal 6.2 compatibility.
- Improved error handling in HTTP client.
- Implemented preliminary parsing of resultsets in XML format.
- Implemented more extensive datatype/xml:lang handling for resultset bindings.
- Added sponsors to README.txt.

Enables the use of SPARQL queries with the RDF API.