Update references to RFC3987 with RDF12-CONCEPTS.

[gkellogg]

Updates other RDF references to RDF 1.2 versions.
Depends on an update to RDF12-CONCEPTS to export the "IRI reference" term. Temporarily skips the check for consistence of common files.

Fixes #355.

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Preview | Diff

[gkellogg]

This is a test of using the RDF Concepts definition of IRI instead of referencing RFC3987.

[dlongley]

Seems ok to me -- other than that RDF12-CONCEPTS is still a working draft and these are normative references. I can't recall how we ought to proceed with these sorts of interim changes, so I'm deferring to those more knowledgeable.

[gkellogg]

The idea of using RDF12-CONCEPTS was to start doing the updates that would naturally come when updating to JSON-LD 1.2, which would come after RDF 1.2. Some of the concepts we need to clarify, such as character space and text direction, are better defined in RDF 1.2, so it makes sense to start updating those references now.

Generally, references can lag, so that as an ED, we can reference WDs. By the time JSON-LD starts going rec-track again, RDF 1.2 should be in CR. Certainly, other necessary updates will be based on changes in RDF 1.2.

[pchampin]

I'm catching up on long overdue PR reviews...
It seems to me that, given the current plan to amend the current REC with class1-3 changes, this PR should not be merged just yet, right?