The prefix foaf, for example, are used by:

And the prefix dc are used by: link to namespace URI +1+1 link to namespace URI +1+1 link to namespace URI +1+1

External Prefixes

We use the following prefixes for External Ontologies.

Prefix URL Explanation
bibo: Bibliography Ontology
bio: Biography Ontology
dc: Dublin Core Elements
dct: Dublin Core Terms
foaf: Friend of a Friend ontology
iso: ISO 25946 ontology (latest ISO standard on thesauri)
luc: Ontotext GraphDB’s built-in Lucene Full Text Search
ontogeo: Ontotext GraphDB geo-spatial extensions, e.g. Places Within Bounding Box, Places Near Each Other
owl: Web Ontology Language
prov: Provenance Ontology
ptop: PROTON ontology, used in Extended Property Constructs
rdf: Resource Description Framework
rdfs: RDF Schema
rr: Relational to RDF Mapping Language, used for conversion only
rrx: R2RML extension (rrx:languageColumn)
schema: common properties
sesame: Special predicate directSubPropertyOf (see query Associative Relations of Agent)
skos: Simple Knowledge Organization System
skosxl: SKOS Extension for Labels
wgs: W3C Geo ontology (WGS stands for the World Geodetic Survey 1984 datum)
xsd: XML Schema Datatypes

Descriptive Prefixes

We use some of the following prefixes for Descriptive Information:

Prefix URL Explanation
adms: Asset Description Metadata Schema
cc: Creative Commons Rights Expression Language
dc: Dublin Core Metadata Element Set
dcat: Data Catalog Vocabulary
dct: DCMI Metadata Terms
dctype: DCMI Type Vocabulary
fmt: RDF formats used in datasets
sd: SPARQL Service Description
vaem: Vocabulary for Attaching Essential Metadata
vann: Vocabulary for annotating vocabulary descriptions
vcard: vCard (contact info)
vdpp: Vocabulary for Dataset Publication Projects
voaf: Vocabulary of a Friend
voag: Vocabulary Of Attribution and Governance
void: Vocabulary of Interlinked Datasets
wdrs: Protocol for Web Description Resources
wv: A vocabulary for waivers of rights