- [RDF 1.1 Concepts and Abstract Syntax](https://www.w3.org/TR/rdf11-concepts/)
- RDF triple
	- Subject
		- URI
	- Predicate
		- URI
	- Object
		- URI
		- Literal (one or two components)
			- plain literal:
				- lexical form + language tag
			- typed literal
				- lexical form + datatype URI