Node interface in rdf js spec

Hello,

Thanks for the effort for creating a spec for rdf js.

I am looking at the Data Model interfaces. I find a need for one more 
concept for a Node (Node extends Term, and is a supertype for NamedNode 
and BlankNode).

This is very useful for modeling subject in quads - 
https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple -

  * thesubject, which is anIRI
    <https://www.w3.org/TR/rdf11-concepts/#dfn-iri>or ablank node
    <https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node>

Also, when naming Named Graphs:

Each named graph is a pair consisting of anIRI 
<https://www.w3.org/TR/rdf11-concepts/#dfn-iri>or a blank node (thegraph 
name), and anRDF graph 
<https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-graph>. Graph names are 
unique within an RDF dataset.

Do you think an interface for modeling this concept will be included in 
the specification?


Best,

Desislava Hristoa