Resource Description Framework (RDF) describes any object as a collection of triples, each consisting of a subject, a predicate and an object. The predicate (also called a property) denotes the relationship. More details (definition, syntax, tutorials) are available at W3C site and elsewhere online.

(description of the resources) http://stackoverflow.com/questions/1740341/what-is-the-difference-between-rdf-and-owl

Resources are described in terms of properties and property values using RDF statements. Statements are represented as triples, consisting of a subject, predicate and object. [S, P, O]

The data model consists of objects and their relationships. Objects are modeled in RDF as Classes (rdf:Class), and Classes have specific Instances. Relationships are modeled with Properties (rdf:Property).

• RDF/XML
• N3
• TURTLE
• JSON serialization is being discussed and some implementations are available