Prefixes
Introduction
The prefix foaf, for example, are used by:
http://xmlns.com/foaf/0.1/
http://purl.org/linked-data/sdmx/2009/measure#
http://xmlns.com/foaf/
http://collider.com/wp-content/uploads/friends#
http://ontologies.yogaholy-days.com/
And the prefix dc are used by:
http://purl.org/dc/elements/1.1/ link to namespace URI +1+1
http://purl.org/dc/terms/ link to namespace URI +1+1
http://dublincore.org/documents/dces/ link to namespace URI +1+1
http://bloody-byte.net/rdf/dc_owl2dl/
External Prefixes
We use the following prefixes for External Ontologies.
| Prefix | URL | Explanation |
| bibo: | http://purl.org/ontology/bibo/ | Bibliography Ontology |
| bio: | http://purl.org/vocab/bio/0.1/ | Biography Ontology |
| dc: | http://purl.org/dc/elements/1.1/ | Dublin Core Elements |
| dct: | http://purl.org/dc/terms/ | Dublin Core Terms |
| foaf: | http://xmlns.com/foaf/0.1/ | Friend of a Friend ontology |
| iso: | http://purl.org/iso25964/skos-thes# | ISO 25946 ontology (latest ISO standard on thesauri) |
| luc: | http://www.ontotext.com/owlim/lucene# | Ontotext GraphDB’s built-in Lucene Full Text Search |
| ontogeo: | http://www.ontotext.com/owlim/geo# | Ontotext GraphDB geo-spatial extensions, e.g. Places Within Bounding Box, Places Near Each Other |
| owl: | http://www.w3.org/2002/07/owl# | Web Ontology Language |
| prov: | http://www.w3.org/ns/prov# | Provenance Ontology |
| ptop: | http://www.ontotext.com/proton/protontop# | PROTON ontology, used in Extended Property Constructs |
| rdf: | http://www.w3.org/1999/02/22-rdf-syntax-ns# | Resource Description Framework |
| rdfs: | http://www.w3.org/2000/01/rdf-schema# | RDF Schema |
| rr: | http://www.w3.org/ns/r2rml# | Relational to RDF Mapping Language, used for conversion only |
| rrx: | http://purl.org/r2rml-ext/ | R2RML extension (rrx:languageColumn) |
| schema: | http://schema.org/ | Schema.org common properties |
| sesame: | http://www.openrdf.org/schema/sesame# | Special predicate directSubPropertyOf (see query Associative Relations of Agent) |
| skos: | http://www.w3.org/2004/02/skos/core# | Simple Knowledge Organization System |
| skosxl: | http://www.w3.org/2008/05/skos-xl# | SKOS Extension for Labels |
| wgs: | http://www.w3.org/2003/01/geo/wgs84_pos# | W3C Geo ontology (WGS stands for the World Geodetic Survey 1984 datum) |
| xsd: | http://www.w3.org/2001/XMLSchema# | XML Schema Datatypes |
Descriptive Prefixes
We use some of the following prefixes for Descriptive Information:
| Prefix | URL | Explanation |
| adms: | http://www.w3.org/ns/adms# | Asset Description Metadata Schema |
| cc: | http://creativecommons.org/ns# | Creative Commons Rights Expression Language |
| dc: | http://purl.org/dc/elements/1.1/ | Dublin Core Metadata Element Set |
| dcat: | http://www.w3.org/ns/dcat# | Data Catalog Vocabulary |
| dct: | http://purl.org/dc/terms/ | DCMI Metadata Terms |
| dctype: | http://purl.org/dc/dcmitype/ | DCMI Type Vocabulary |
| fmt: | http://www.w3.org/ns/formats/ | RDF formats used in datasets |
| sd: | http://www.w3.org/ns/sparql-service-description# | SPARQL Service Description |
| vaem: | http://www.linkedmodel.org/schema/vaem# | Vocabulary for Attaching Essential Metadata |
| vann: | http://purl.org/vocab/vann/ | Vocabulary for annotating vocabulary descriptions |
| vcard: | http://www.w3.org/2006/vcard/ns# | vCard (contact info) |
| vdpp: | http://data.lirmm.fr/ontologies/vdpp# | Vocabulary for Dataset Publication Projects |
| voaf: | http://purl.org/vocommons/voaf# | Vocabulary of a Friend |
| voag: | http://voag.linkedmodel.org/voag# | Vocabulary Of Attribution and Governance |
| void: | http://rdfs.org/ns/void# | Vocabulary of Interlinked Datasets |
| wdrs: | http://www.w3.org/2007/05/powder-s# | Protocol for Web Description Resources |
| wv: | http://vocab.org/waiver/terms/ | A vocabulary for waivers of rights |