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The Hydra Core Vocabulary

URI: http://www.w3.org/ns/hydra/core
Publisher(s): Hydra W3C Community Group
Rights: © © 2012-2014 the Contributors to the Hydra Core Vocabulary Specification
Ontology RDF: RDF (turtle)

Description

A lightweight vocabulary for hypermedia-driven Web APIs

Table of Contents

Classes
Properties
Namespaces
Legend

Overview

Pictures say 1,000 words

Figure 1: Ontology overview

Classes ↑

Hydra Class
Header specification

Hydra Class^c # Classes

URI	`http://www.w3.org/ns/hydra/core#Class`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	The class of Hydra classes.
Super-classes	rdfs:Class^c
Members	http://www.w3.org/ns/hydra/core#Error http://www.w3.org/ns/hydra/core#IriTemplateMapping http://www.w3.org/ns/hydra/core#Status http://www.w3.org/ns/hydra/core#BaseUriSource http://www.w3.org/ns/hydra/core#Operation http://www.w3.org/ns/hydra/core#ApiDocumentation http://www.w3.org/ns/hydra/core#SupportedProperty http://www.w3.org/ns/hydra/core#Collection http://www.w3.org/ns/hydra/core#IriTemplate http://www.w3.org/ns/hydra/core#VariableRepresentation http://www.w3.org/ns/hydra/core#PartialCollectionView http://www.w3.org/ns/hydra/core#Link http://www.w3.org/ns/hydra/core#Resource http://www.w3.org/ns/hydra/core#TemplatedLink

Header specification^c # Classes

URI	`http://www.w3.org/ns/hydra/core#HeaderSpecification`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Specifies a possible either expected or returned header values
Super-classes	http://www.w3.org/ns/hydra/core#Resource^c
In domain of	possible header value closed set header name

Properties ↑

closed set^p # Props

URI	`http://www.w3.org/ns/hydra/core#closedSet`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Determines whether the provided set of header values is closed or not.
Domain(s)	Header specification^c
Range(s)	xsd:boolean^c

description^p # Props

URI	`http://www.w3.org/ns/hydra/core#description`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	A description.
Super-properties	rdfs:comment
Range(s)	xsd:string^c

expects header^p # Props

URI	`http://www.w3.org/ns/hydra/core#expectsHeader`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Specification of the header expected by the operation.
Domain(s)	http://www.w3.org/ns/hydra/core#Operation^c

extension^p # Props

URI	`http://www.w3.org/ns/hydra/core#extension`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Hint on what kind of extensions are in use.
Domain(s)	http://www.w3.org/ns/hydra/core#ApiDocumentation^c

freetext query^p # Props

URI	`http://www.w3.org/ns/hydra/core#freetextQuery`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	A property representing a freetext query.
Domain(s)	http://www.w3.org/ns/hydra/core#Resource^c
Range(s)	xsd:string^c

header name^p # Props

URI	`http://www.w3.org/ns/hydra/core#headerName`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Name of the header.
Domain(s)	Header specification^c
Range(s)	xsd:string^c

take^p # Props

URI	`http://www.w3.org/ns/hydra/core#limit`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Instructs to limit set only to N elements.
Range(s)	xsd:nonNegativeInteger^c

mapping^p # Props

URI	`http://www.w3.org/ns/hydra/core#mapping`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	A variable-to-property mapping of the IRI template.
Domain(s)	http://www.w3.org/ns/hydra/core#IriTemplate^c
Range(s)	http://www.w3.org/ns/hydra/core#IriTemplateMapping^c

method^p # Props

URI	`http://www.w3.org/ns/hydra/core#method`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	The HTTP method.
Domain(s)	http://www.w3.org/ns/hydra/core#Operation^c
Range(s)	xsd:string^c

skip^p # Props

URI	`http://www.w3.org/ns/hydra/core#offset`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Instructs to skip N elements of the set.
Range(s)	xsd:nonNegativeInteger^c

page index^p # Props

URI	`http://www.w3.org/ns/hydra/core#pageIndex`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Instructs to provide a specific page of the collection at a given index.
Super-properties	page reference
Range(s)	xsd:nonNegativeInteger^c

page reference^p # Props

URI	`http://www.w3.org/ns/hydra/core#pageReference`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Instructs to provide a specific page reference of the collection.

possible header value^p # Props

URI	`http://www.w3.org/ns/hydra/core#possibleValue`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Possible value of the header.
Domain(s)	Header specification^c
Range(s)	xsd:string^c

property^p # Props

URI	`http://www.w3.org/ns/hydra/core#property`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	A property
Range(s)	rdf:Property^c

readable^p # Props

URI	`http://www.w3.org/ns/hydra/core#readable`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	True if the client can retrieve the property's value, false otherwise.
Domain(s)	http://www.w3.org/ns/hydra/core#SupportedProperty^c
Range(s)	xsd:boolean^c

required^p # Props

URI	`http://www.w3.org/ns/hydra/core#required`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	True if the property is required, false otherwise.
Range(s)	xsd:boolean^c

relative Uri resolution^p # Props

URI	`http://www.w3.org/ns/hydra/core#resolveRelativeUsing`
Is Defined By	http://www.w3.org/ns/hydra/core
Domain(s)	http://www.w3.org/ns/hydra/core#IriTemplate^c
Range(s)	http://www.w3.org/ns/hydra/core#BaseUriSource^c

returns header^p # Props

URI	`http://www.w3.org/ns/hydra/core#returnsHeader`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	Name of the header returned by the operation.
Domain(s)	http://www.w3.org/ns/hydra/core#Operation^c

status code^p # Props

URI	`http://www.w3.org/ns/hydra/core#statusCode`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	The HTTP status code. Please note it may happen this value will be different to actual status code received.
Domain(s)	http://www.w3.org/ns/hydra/core#Status^c
Range(s)	xsd:integer^c

template^p # Props

URI	`http://www.w3.org/ns/hydra/core#template`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	A templated string with placeholders. The literal's datatype indicates the template syntax; if not specified, hydra:Rfc6570Template is assumed.
Domain(s)	http://www.w3.org/ns/hydra/core#IriTemplate^c
Range(s)	http://www.w3.org/ns/hydra/core#Rfc6570Template^c

title^p # Props

URI	`http://www.w3.org/ns/hydra/core#title`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	A title, often used along with a description.
Super-properties	rdfs:label
Range(s)	xsd:string^c

total items^p # Props

URI	`http://www.w3.org/ns/hydra/core#totalItems`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	The total number of items referenced by a collection.
Domain(s)	http://www.w3.org/ns/hydra/core#Collection^c
Range(s)	xsd:integer^c

variable^p # Props

URI	`http://www.w3.org/ns/hydra/core#variable`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	An IRI template variable
Domain(s)	http://www.w3.org/ns/hydra/core#IriTemplateMapping^c
Range(s)	xsd:string^c

variable representation^p # Props

URI	`http://www.w3.org/ns/hydra/core#variableRepresentation`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	The representation format to use when expanding the IRI template.
Domain(s)	http://www.w3.org/ns/hydra/core#IriTemplateMapping^c
Range(s)	http://www.w3.org/ns/hydra/core#VariableRepresentation^c

writable^p # Props

URI	`http://www.w3.org/ns/hydra/core#writable`
Is Defined By	http://www.w3.org/ns/hydra/core
Description	True if the client can change the property's value, false otherwise.
Domain(s)	http://www.w3.org/ns/hydra/core#SupportedProperty^c
Range(s)	xsd:boolean^c

Namespaces ↑

default (:): http://www.w3.org/ns/hydra/core
cc: http://creativecommons.org/ns#
dct: http://purl.org/dc/terms/
owl: http://www.w3.org/2002/07/owl#
prov: http://www.w3.org/ns/prov#
rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns#
rdfs: http://www.w3.org/2000/01/rdf-schema#
schema: http://schema.org/
sdo: https://schema.org/
skos: http://www.w3.org/2004/02/skos/core#
vann: http://purl.org/vocab/vann/
vs: http://www.w3.org/2003/06/sw-vocab-status/ns#
xsd: http://www.w3.org/2001/XMLSchema#

Legend

^c	Classes
^op	Object Properties
^fp	Functional Properties
^dp	Data Properties
^dp	Annotation Properties
^p	Properties
ⁿⁱ	Named Individuals