RDF

RDF, aka Resource Description Framework, is a data notation created in 1997.

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27Years Old

The Resource Description Framework (RDF) is a family of World Wide Web Consortium (W3C) specifications originally designed as a metadata data model. It has come to be used as a general method for conceptual description or modeling of information that is implemented in web resources, using a variety of syntax notations and data serialization formats. It is also used in knowledge management applications. Read more on Wikipedia...

RDF website
RDF Wikipedia page
RDF docs
RDF first developed in World Wide Web Consortium
See also: (9 related languages)OWL, XML, Turtle, JSON, Unicode, SPARQL, SQL, Python, JSON-LD

Example from Wikipedia:

@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix dc:   <http://purl.org/dc/elements/1.1/> .

<http://en.wikipedia.org/wiki/Tony_Benn>
    dc:publisher "Wikipedia" ;
    dc:title "Tony Benn" ;
    foaf:primaryTopic [
        a foaf:Person ;
        foaf:name "Tony Benn"
    ] .

Feature	Supported	Token	Example
Triples	✓
Type Inference	✓

RDF - Data notation

Language features