LOD: License validation does not canonicalise URL forms

[nevali]

Ingesting the URL:

http://sameas.org/rdf?uri=http://data.ordnancesurvey.co.uk/id/50kGazetteer/74563

Results in an RDF/XML document which describes itself (including an explicit CC0 licensing predicate) using the subject URI

http://sameas.org/rdf?uri=http%3A%2F%2Fdata.ordnancesurvey.co.uk%2Fid%2F50kGazetteer%2F74563

The two URIs are canonically equivalent, but the license validation fails.

[nevali]

This appears at first blush to be an issue with librdf's librdf_model_find_statements() matching against a URI node.

The same issue does not appear to manifest in Spindle, presumably because the URIs are freshly-serialised by librdf itself.