Distinguish the RDF Data Model from the Abstract Syntax

[gkellogg]

From @afs's review.

Observation

There is a mixture of "Abstract Syntax" and "Data Model". We should have a consistent way to say "Abstract Syntax" vs "Data Model". One way is to use "Abstract Syntax" as the basis of semantics and usually say "Data Model" in Concepts otherwise.

Section 1.1 Graph-based Data Model

suggestion

Possible improvement - rename as "RDF Data Model". Here, the section is called "Graph-based Data Model" but immediately it says "abstract syntax".

Change: ==> "The core structure of RDF is a graph, represented as a set of triples,"

Section 3. RDF Graphs

suggestion

This is the data model (abstract syntax). Maybe change the section name to "RDF Graph Data Model".

The intro section could have the preliminary explanation of RDF Strings.