Vocabulary of Interlinked Datasets (VoID)
type: Ontology
description: The Vocabulary of Interlinked Datasets (VoID) is an RDF Schema vocabulary for expressing metadata about RDF datasets. It is intended as a bridge between the publishers and users of RDF data, with applications ranging from data discovery to cataloging and archiving of datasets. This document provides a formal definition of the new RDF classes and properties introduced for VoID. It is a companion to the main specification document for VoID, Describing Linked Datasets with the VoID Vocabulary.
modified: 2011-06-17
preferred namespace uri: http://rdfs.org/ns/void#
preferred namespace prefix: void
creator: Richard Cyganiak
creator: Jun Zhao
creator: Keith Alexander
creator: Michael Hausenblas

Richard Cyganiak
type: Person

Digital Enterprise Research Institute, NUI Galway
type: Organization
member: Richard Cyganiak

Jun Zhao
type: Person

Department of Zoology, University of Oxford
type: Organization
member: Jun Zhao

Keith Alexander
type: Person

Talis
type: Organization
member: Keith Alexander

Michael Hausenblas
type: Person

LiDRC
type: Organization
member: Michael Hausenblas

dataset
type: Class
comment: A set of RDF triples that are published, maintained or aggregated by a single provider.
subclass of: Dataset

linkset
type: Class
comment: A collection of RDF links between two void:Datasets.
subclass of: dataset

technical feature
type: Class
comment: A technical feature of a void:Dataset, such as a supported RDF serialization format.

dataset description
type: Class
comment: A web resource whose foaf:primaryTopic or foaf:topics include void:Datasets.
subclass of: Document

feature
type: Property
domain: dataset
range: technical feature

has subset
type: Property
domain: dataset
range: dataset

Target
type: Property
comment: One of the two datasets linked by the Linkset.
domain: linkset
range: dataset

has a SPARQL endpoint at
type: Property
domain: dataset

a link predicate
type: Property
domain: linkset
range: Property

example resource of dataset
type: Property
domain: dataset
range: Resource

vocabulary
type: Property
comment: A vocabulary that is used in the dataset.
domain: dataset

Subjects Target
type: Property
type: FunctionalProperty
comment: The dataset describing the subjects of triples contained in the Linkset.
domain: linkset
range: dataset
sub property of: Target

Objects Target
type: Property
type: FunctionalProperty
comment: The dataset describing the objects of the triples contained in the Linkset.
domain: linkset
range: dataset
sub property of: Target

Data Dump
type: Property
comment: An RDF dump, partial or complete, of a void:Dataset.
domain: dataset
range: Resource

has an URI look-up endpoint at
type: Property
comment: Defines a simple URI look-up protocol for accessing a dataset.
domain: dataset

has URI regular expression pattern
type: Property
comment: Defines a regular expression pattern matching URIs in the dataset.
domain: dataset

class
type: Property
type: FunctionalProperty
comment: The rdfs:Class that is the rdf:type of all entities in a class-based partition.
domain: dataset
range: Class

classes
type: Property
type: DatatypeProperty
comment: The total number of distinct classes in a void:Dataset. In other words, the number of distinct resources occuring as objects of rdf:type triples in the dataset.
domain: dataset
range: integer

class partition
type: Property
comment: A subset of a void:Dataset that contains only the entities of a certain rdfs:Class.
domain: dataset
range: dataset
sub property of: has subset

distinct objects
type: Property
type: DatatypeProperty
comment: The total number of distinct objects in a void:Dataset. In other words, the number of distinct resources that occur in the object position of triples in the dataset. Literals are included in this count.
domain: dataset
range: integer

distinct subjects
type: Property
type: DatatypeProperty
comment: The total number of distinct subjects in a void:Dataset. In other words, the number of distinct resources that occur in the subject position of triples in the dataset.
domain: dataset
range: integer

number of documents
type: Property
type: DatatypeProperty
comment: The total number of documents, for datasets that are published as a set of individual documents, such as RDF/XML documents or RDFa-annotated web pages. Non-RDF documents, such as web pages in HTML or images, are usually not included in this count. This property is intended for datasets where the total number of triples or entities is hard to determine. void:triples or void:entities should be preferred where practical.
domain: dataset
range: integer

number of entities
type: Property
type: DatatypeProperty
comment: The total number of entities that are described in a void:Dataset.
domain: dataset
range: integer

in dataset
type: Property
comment: Points to the void:Dataset that a document is a part of.
domain: Document
range: dataset
sub property of: isPartOf

open search description
type: Property
comment: An OpenSearch description document for a free-text search service over a void:Dataset.
domain: dataset
range: Document

number of properties
type: Property
type: DatatypeProperty
comment: The total number of distinct properties in a void:Dataset. In other words, the number of distinct resources that occur in the predicate position of triples in the dataset.
domain: dataset
range: integer

property
type: Property
type: FunctionalProperty
comment: The rdf:Property that is the predicate of all triples in a property-based partition.
domain: dataset
range: Property

property partition
type: Property
comment: A subset of a void:Dataset that contains only the triples of a certain rdf:Property.
domain: dataset
range: dataset
sub property of: has subset

root resource
type: Property
comment: A top concept or entry point for a void:Dataset that is structured in a tree-like fashion. All resources in a dataset can be reached by following links from its root resources in a small number of steps.
domain: dataset

number of triples
type: Property
type: DatatypeProperty
comment: The total number of triples contained in a void:Dataset.
domain: dataset
range: integer

URI space
type: Property
type: DatatypeProperty
comment: A URI that is a common string prefix of all the entity URIs in a void:Dataset.
domain: dataset
range: Literal