COMMONSRDF-55: Support Jena's urn:x-arq:DefaultGraph and friends
authorStian Soiland-Reyes <stain@apache.org>
Wed, 8 Feb 2017 14:40:03 +0000 (14:40 +0000)
committerStian Soiland-Reyes <stain@apache.org>
Wed, 8 Feb 2017 14:40:03 +0000 (14:40 +0000)
commit6d4e333d9398c1f7533a4e20a5768eada97a4ea6
treee4031cc820fb2b38546dee9b6608b9336f1b779d
parent5e2430ff91a173cc0b4e175342383e039b044bd8
parent71833695488bec404b433bd4e2f817021232855d
COMMONSRDF-55: Support Jena's urn:x-arq:DefaultGraph and friends

Jena uses the IRIs <urn:x-arq:DefaultGraph> and
<urn:x-arq:DefaultGraphNode> to represent the default graph, not null.

This code recognize these specially so they appear in
Commons RDF land as quad.getGraphName() == Optional.empty()
rather than as IRIs (but only if adapted from a JenaIRI or Jena Quad)