LD Fragments integration

[ktk]

It's not top priority but I do think it would make sense to think about how we could integrate LD Fragments support as well. I probably could do it with Varnish and a LD Fragments server on another node instance but maybe there are smarter ways to do this.

[bergos]

I see the biggest problem in the LDF requirement that all blank nodes must be mapped to IRIs.

common:

• add a .getTriplePatternFragment method to handler

ldp-module-handler:

• blank node to IRI mapping could be done once during the server startup
• a generic package, like the ldp module, could implement the LDF HTTP interface

sparql-handler:

• maybe a script could create shadow named graphs with the mapped nodes
• add a .buildLDFQuery method with a default implementation to the handler