VoID support about d2rq HOT 3 CLOSED

Current Plan:

1. void:inDataset on all RDF representations

• handled via the metadata template, the dataset IRI as a template variable, about:metadata:config:dataset

2. assign a dataset IRI

• d2r:baseURI + "dataset"

3. serve a VoID description that includes all information we know, such as SPARQL endpoint and perhaps even stats

• DatasetDescriptionServlet creates HTML and RDF descriptions of the dataset, including supported formats, root resources, class and property partitions, vocabularies, and SPARQL endpoint

4. allow mixing a user-provided RDF file into the VoID description

• User can provide dataset-metadata.ttl, which will be mixed into the dataset description

5. Also, SPARQL Service Description should be served from the SPARQL endpoint URI

• Deferred, would require Joseki/Fuseki modifications, see issue #148

from d2rq.

commit 61b2b5e contains support for 1), 2) and 3)

from d2rq.

commit 3d16138 contains support for 4) and some wrap-up

• D2R server configuration now supports specification of two metadata templates, d2r:metadataTemplate for the resource metadata, d2r:datasetMetadataTemplate for the dataset description metadata template.
• added on/off switch to configuration d2r:disableMetadata property (any value) switches off resource and dataset metadata generation
• default templates for dataset and resource metadata in webapp/WEB-INF/dataset-metadata.ttl and webapp/WEB-INF/resource-metadata.ttl, configurable via D2R server configuration as well.

from d2rq.