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The RDFS class of classes used to define sets of resources.
DESCRIPTION
rdfs:Class denotes classes, which are sets of resources in RDF Schema. Instances of a class are related via rdf:type. Class hierarchies are built using rdfs:subClassOf, supporting inheritance of membership. In OWL, classes gain richer constructs like intersections and restrictions. rdfs:Class forms the foundation for ontologies and domain modeling. It enables clear semantics and validation when paired with SHACL or OWL reasoners.
ALTERNATIVE DEFINITIONS
W3C RDF Schema 1.1
rdfs:Class is the class of classes.
Concise canonical description of rdfs:Class role.
W3C RDF 1.1 Primer
RDF Schema provides a mechanism for describing groups of related resources and the relationships between these resources; classes are used to group resources.
Explains classes in the broader RDFS context.
Apache Jena
Classes represent sets of individuals; resources become members by asserting rdf:type statements.
Developer-focused view linking rdf:type membership.
RELATED TERMS
RDF Schema rdf:type rdfs:subClassOf Domain Model Class Hierarchy Knowledge Representation Simple Knowledge Organization System OWL RDF
COMPETING TERMS
OWL Class
KNOWLEDGE AREAS
Semantic & Knowledge Modeling Data Modeling Data Architecture
TARGET AUDIENCE
Data Modeler Data Architect AI Engineer Data Engineer Software Developer
EXTERNAL SOURCES
- Wikipedia - RDF Schema
- W3C - Normative RDFS definition of Class
- W3C - OWL classes and richer constructs
- Apache Jena - Ontologies and classes in Jena
TOP QUESTIONS
What is rdfs:Class in RDF Schema?
It is the class of classes, used to define sets of resources whose members are linked via rdf:type.
Category: Definition
How does rdfs:Class relate to rdf:type?
rdf:type asserts membership of a resource in a class; classes are instances of rdfs:Class.
Category: Relationship
What is the role of rdfs:subClassOf with rdfs:Class?
It builds class hierarchies, where subclass instances are also instances of their superclasses.
Category: Semantics
How does rdfs:Class compare to owl:Class?
owl:Class adds richer constructs and formal semantics; rdfs:Class provides foundational class grouping.
Category: Comparison
Can rdfs:Class be used with SHACL?
Yes, SHACL shapes can validate instances of classes with constraints.
Category: Integration
What mistakes occur with rdfs:Class?
Confusing classes with instances or misusing class URIs as individuals without punning in OWL.
Category: Mistakes
How do tools handle rdfs:Class?
Jena and RDF4J provide APIs and reasoners for class membership and hierarchy.
Category: Tooling
Is rdfs:Class transitive?
Class membership itself is not transitive, but rdfs:subClassOf is a transitive property.
Category: Clarification
How to model domain classes effectively?
Define clear class URIs, use rdfs:subClassOf hierarchies, and document intended membership and constraints.
Category: Best practices