RDF

A W3C standard for describing resources on the web using a graph-based data model of subject-predicate-object triples. RDF provides a foundation for the Semantic Web by enabling machine-readable metadata that can describe relationships between web resources, including accessibility characteristics. In the context of accessibility, RDF has been used for storing web page annotations that describe structural and navigational elements, enabling assistive technologies to provide enhanced browsing experiences. RDF can be serialized in multiple formats including XML, Turtle, and JSON-LD, and is queried using the SPARQL language.