Section 2.3 (Graph Schemas) of the Big Data book describes a graph schema with three core components:
- Nodes are the entities in the system
- Edges are the relationships between nodes
- Properties are information about entities (composed of a name and a value)
This is an RDF model, where Edge is a specialized Property.
The term Equivs appears many times through out the book, with the same meaning as owl:sameAs.