RDFRDFS

RDFRDFS refers to the combination of RDF (Resource Description Framework) and RDF Schema (RDFS), two foundational standards of the World Wide Web Consortium (W3C) for modeling and describing data on the Web. RDF provides a simple, flexible data model for representing information as statements about resources, while RDFS adds a basic schema vocabulary to describe classes and properties and to define simple hierarchies and constraints. Together, RDF and RDFS support data interoperability, reuse, and basic reasoning across diverse data sources.

RDF is a data model based on triples: a subject, a predicate, and an object. Each element is identified by a URI or a literal value, and triples form a directed labeled graph. RDF data can be serialized in formats such as RDF/XML, Turtle, N-Triples, and JSON-LD. The model is designed to be language and platform agnostic, enabling merging of data from multiple sources into a unified graph.

RDFS provides vocabulary to describe the structure of RDF data. Core terms include rdfs:Class, rdfs:Resource, and rdfs:Property, along with relationships such as rdfs:subClassOf and rdfs:subPropertyOf. It also defines rdfs:domain and rdfs:range to express constraints on properties, and rdfs:label and rdfs:comment for human-readable annotations. RDFS enables simple inferencing: for example, if a resource is an instance of a subclass, it is also an instance of its superclass, and statements using a sub-property can infer statements using the corresponding super-property.

RDFRDFS is widely used for knowledge graphs, data catalogs, and ontology sketching. It offers basic expressivity and reasoning capabilities, but is less expressive than OWL, which provides more complex constraints and semantics.