RDF is the semantic web technology used to experess properties of web pages and in general URIs oncluding those representing things outside of the web. RDF is expressed using subject-predicate-object triples, where both the subject and predicate have to be URIs, but the object may also be soem form of literal value such as a number or string. This allows one to express statements such as:
<https://alandix.com/academic/> <ex:is_about> "Alan Dix"
Defined on pages 392, 392
Used on pages 169, 391, 392, 393, 394, 395, 396, 397, 398, 401, 405, 417, 435
Also known as resource description framework