Add support for SPARQL queries against multiple named graph on the Jena TDB
store
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Key: CLEREZZA-467
URL: https://issues.apache.org/jira/browse/CLEREZZA-467
Project: Clerezza
Issue Type: Improvement
Reporter: Olivier Grisel
Jena TDB supports queries involving mutliple named graph (along with a default
graph).
It would be very useful if those named graphs could be mapped to the Clerezza
graph ids used by TcProvider.
Implementing this will likely require a change in the current filesystem
directory structure used by the TdbTcProvider#getMGraph implementation: graphs
are currently stored in isolated datasets under separate folders on the hard
drive. Instead one should use a common dataset folder and make
TdbTcProvider#getMGraph calls:
Model model = dataset.getNamedModel(graphUri);
instead of the current use of the default model of each isolated dataset:
Model model = dataset.getDefaultModel();
A migration path from the old storage structure to the new one should be
provided as part of the release notes.
Relevant parts of the Jena TDB documentation:
http://www.openjena.org/wiki/TDB/Datasets
http://www.openjena.org/wiki/TDB/DynamicDatasets
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