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RDFa Core Initial Context

This list of predefined prefixes have been defined for RDFa as an “initial context”: essentially, RDFa users can use these prefixes without having the obligation of defining the prefixes in the HTML code. The same list of prefixes have also been defined for JSON-LD as a JSON-LD Context at the URI https://www.w3.org/2013/json-ld-context/rdfa11; JSON-LD users can use the @context key with that URI as a shorthand to use the same prefixes.

Vocabulary Prefixes

Vocabulary Prefixes of W3C Documents (Recommendations or Notes)
Prefix	URI	Description	For more details see	Origin
as	https://www.w3.org/ns/activitystreams#	Activity Vocabulary	Activity Vocabulary	W3C Recommendation
csvw	https://www.w3.org/ns/csvw#	Metadata for Tabular Data	Metadata Vocabulary for Tabular Data	W3C Recommendation
dcat	https://www.w3.org/ns/dcat#	Data Catalog Vocabulary	Data Catalog Vocabulary (DCAT)	W3C Recommendation
dqv	https://www.w3.org/ns/dqv#	Data Quality Vocabulary	Data on the Web Best Practices: Data Quality Vocabulary	W3C WG Note
duv	https://www.w3.org/ns/duv#	Dataset Usage Vocabulary	Dataset Usage Vocabulary	W3C WG Note
grddl	https://www.w3.org/2003/g/data-view#	GRDDL	Gleaning Resource Descriptions from Dialects of Languages (GRDDL)	W3C Recommendation
jsonld	https://www.w3.org/ns/json-ld#	JSON-LD	JSON-LD 1.1, A JSON-based Serialization for Linked Data	W3C Recommendation
ldp	https://www.w3.org/ns/ldp#	Linked Data Platform Vocabulary	Linked Data Platform 1.0	W3C Recommendation
ma	https://www.w3.org/ns/ma-ont#	Ontology for Media Resources	Ontology for Media Resources 1.0	W3C Recommendation
oa	https://www.w3.org/ns/oa#	Web Annotation Vocabulary	Web Annotation Vocabulary	W3C Recommendation
odrl	https://www.w3.org/ns/odrl/2/	ODRL Vocabulary & Expression 2.2	ODRL Vocabulary & Expression 2.2	W3C Recommendation
org	https://www.w3.org/ns/org#	Organizations	The Organization Ontology	W3C Recommendation
owl	https://www.w3.org/2002/07/owl#	OWL	OWL Overview	W3C Recommendation
prov	https://www.w3.org/ns/prov#	Provenance Vocabulary	Provenance Ontology	W3C Recommendation
qb	https://purl.org/linked-data/cube#	Data Cubes	The RDF Data Cube Vocabulary	W3C Recommendation
rdf	https://www.w3.org/1999/02/22-rdf-syntax-ns#	RDF	RDF Semantics	W3C Recommendation
rdfa	https://www.w3.org/ns/rdfa#	RDFa Vocabulary	RDFa Core 1.1	W3C Recommendation
rdfs	https://www.w3.org/2000/01/rdf-schema#	RDF Schema	RDF Semantics	W3C Recommendation
rif	https://www.w3.org/2007/rif#	RIF	RIF Overview	W3C Recommendation
rr	https://www.w3.org/ns/r2rml#	R2RML	R2RML: RDB to RDF Mapping Language	W3C Recommendation
sd	https://www.w3.org/ns/sparql-service-description#	SPARQL 1.1 Service Description	SPARQL 1.1 Service Description	W3C Recommendation
skos	https://www.w3.org/2004/02/skos/core#	SKOS Core	SKOS Simple Knowledge Organization System Reference	W3C Recommendation
skosxl	https://www.w3.org/2008/05/skos-xl#	SKOS eXtension for Labels	SKOS Simple Knowledge Organization System Reference	W3C Recommendation
ssn	https://www.w3.org/ns/ssn/	Semantic Sensor Network Ontology	Semantic Sensor Network Ontology	W3C Recommendation
sosa	https://www.w3.org/ns/sosa/	Sensor, Observation, Sample, and Actuator Ontology	Semantic Sensor Network Ontology	W3C Recommendation
time	https://www.w3.org/2006/time#	Time Ontology	Time Ontology in OWL	W3C Recommendation
void	https://rdfs.org/ns/void#	VoID	Describing Linked Datasets with the VoID Vocabulary	W3C Interest Group Note
wdr	https://www.w3.org/2007/05/powder#	POWDER	Protocol for Web Description Resources (POWDER): Formal Semantics	W3C Recommendation
wdrs	https://www.w3.org/2007/05/powder-s#	POWDER-S	Protocol for Web Description Resources (POWDER): Formal Semantics	W3C Recommendation
xhv	https://www.w3.org/1999/xhtml/vocab#	RDFa Default Prefix	RDFa Core 1.1	W3C Recommendation
xml	https://www.w3.org/XML/1998/namespace	XML Reserved Prefix	Namespaces in XML 1.0	W3C Recommendation
xsd	https://www.w3.org/2001/XMLSchema#	XML Schema Datatypes	XML Schema Part 2: Datatypes Second Edition	W3C Recommendation

Some vocabularies are currently in development at W3C and they may become W3C Recommendations or Notes, i.e., may become part of the table above. It is therefore advisable to consider their prefixes reserved for now. These are:

earl: for “https://www.w3.org/ns/earl#”, see “Evaluation and Report Language (EARL) 1.0 Guide”

Widely used Vocabulary prefixes based on the vocabulary usage on the Semantic Web
Prefix	URI	Description	For more details see
cc	https://creativecommons.org/ns#	ccREL	ccREL: The Creative Commons Rights Expression Language
ctag	https://commontag.org/ns#	Common Tag Ontology	Common Tag Specification
dc	https://purl.org/dc/terms/	Dublin Core Metadata Terms	DCMI Metadata Terms
dcterms	https://purl.org/dc/terms/	Dublin Core Metadata Terms	DCMI Metadata Terms
dc11	https://purl.org/dc/elements/1.1/	Dublin Core Metadata Element Set, Version 1.1	Dublin Core Metadata Element Set, Version 1.1
foaf	https://xmlns.com/foaf/0.1/	FOAF	FOAF Vocabulary Specification
gr	https://purl.org/goodrelations/v1#	GoodRelations Ontology	GoodRelations Language Reference
ical	https://www.w3.org/2002/12/cal/icaltzd#	iCalendar terms in RDF	iCalendar terms in RDF
og	https://ogp.me/ns#	Facebook's Open Graph protocol	Open Graph Protocol
rev	https://purl.org/stuff/rev#	RDF Review Vocabulary	RDF Review Vocabulary
sioc	https://rdfs.org/sioc/ns#	SIOC Core Ontology	SIOC Core Ontology Specification
v	https://rdf.data-vocabulary.org/#	Google Rich Snippets' Vocabularies	Rich snippets (microdata, microformats, and RDFa)
vcard	https://www.w3.org/2006/vcard/ns#	vCard in RDF	Representing vCard Objects in RDF
schema	https://schema.org/	The Schema.org vocabulary	Full Schema.org documentation

Vocabulary Terms

Terms defined by W3C Documents
Term	URI	Description	For more details see
describedby	https://www.w3.org/2007/05/powder-s#describedby	Refers to resource providing a description.	POWDER: Formal Semantics, Section 5, POWDER Processor Semantics
license	https://www.w3.org/1999/xhtml/vocab#license	Refers to a license associated with this context.	IANA Link Relations
role	https://www.w3.org/1999/xhtml/vocab#role	indicates the purpose of the resource. See the XHTML Role Vocabulary for roles in this vocabulary space	XHTML Role Attribute Module

Ivan Herman, ivan@w3.org, W3C, Digital Publishing Activity Lead, Updated: 2020-05-09

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