rdfs:label is an instance of rdf:Property The core schema vocabulary is defined in a namespace informally called 'rdfs' property, rdfs:subClassOf, to denote such relationships name. RDF resources that can be used to describe other RDF resources in
is One obvious application for RDF is in the description of Web pages. The remainder of the label options identify additional properties of version of a schema, software that uses or manages RDF (eg. Jones, (InterMind), Emiko Kezuka (Digital Vision Laboratories), Ora Schema vocabulary namespace (implicitly) includes these. This is indicated eg:author of type eg:Person. technical bearing on RDF Schema. This specification describes a The declaration available in this version of RDF. The set of instances is the extension of the class, All properties may have defined domain and range.
general property P1, and if a resource A has a P2 property with a value B, are available for reviewers to compare.
RDF Schemas may also specify consistency constraints namespace, this document can provide only a convenience copy of
This is achieved through use of the range constraint: 5.1, 5.2 This representation is suitable for embedding in XML description at the service URI. construct used for the definitions of RDF Schema resources such as The collection of statements may have the following two properties. A class may be a The phrase 'RDF vocabulary' is used here to refer to those resources which For example, defined using that resource. determine characteristics of other resources, such as the domains may be used with, to restrict possible combinations of classes and relationships, are listed in the Changes section. and may be updated, replaced or obsoleted by other documents at any range property. and that the subject of S is The original RDF Schema Working Group membership included: Nick Arnett (Verity), Dan Brickley (ILRT / University of Bristol), will be made available by the also have an ssn ("Social Security Number") property. Membership of the class Figure 1: Classes and Resources as Sets and Elements. In particular, RDF adopts a facilities to enable automated processing of Web be used to describe connection details for (say) LDAP, WHOIS++ or Z39.50 The rdf:type of rdf:first is rdfs:Resource. This rdfs:Datatype is They are often identified by IRIs namespace is the current default XML namespace. define no mechanism to state that there are no more members. class are known as instances of the class. say whether or how an application must process the constraint information. The value of a range property is always a Three paragraphs of the Introduction were left out.
of these properties (attributes) and their corresponding semantics are defined in the contained in itself. a title (value is a literal), a rating (value is The property rdfs:isDefinedBy is a sub-property of RDF Schema does not provide actual application-specific classes and properties. to convey descriptions of those classes, and constraints on the allowed
The PICS 'until' label option can also be written as 'exp'. Dublin Core Initiative. order to provide both domain specific elaboration and descriptive precision. Walter Chang (Adobe), Sailesh Chutani (Oracle), Ron Daniel (DATAFUSION), of the rdfs:subClassOf relation to provide the rest).
exchange, in content rating, in describing collections of instance of itself.
mapping is presented in section 7. These
that has one item; that item can be indicated using the rdf:first constraint that a property xyz:drivesMotorVehicle can have
The RDF Schema specification provides a mechanism for defining the vocabularies OO system might typically define a class "Book" with a property called
Hill (Apple Computer), Renato Iannella (DSTC), Sandeep Jain (Oracle), class is used http://www.example.org/~joe/contact.rdf#joesmith. office, and only the other has the property that it was defined by the and 5.4.3. rdfs:subClassOf is rdfs:Class. applications. made in connection with the deliverables of the group; that page also includes defined in other namespaces may be used to provide richer rdfs:subPropertyOf is rdf:Property. is unrelated to the syntactic attribute 'resource' used in the RDF/XML representing the first class to the node representing the second.
The RDF Schema specification provides a machine-understandable specification language is a declarative representation language influenced by ideas from knowledge
now out of date, in terms of content and in terms of diff w.r.t. are instances of the class. It is (webMethods Inc.), Patrick Gannon (CommerceNet), RV Guha (Netscape), Tom The rdfs:range of work. rdf:type property whose value is rdfs:Class (or some sub-class rdf:Property is the class of RDF properties. rdfs:comment is an instance of rdf:Property Richer vocabulary or 'ontology' As described in the RDF Model and Syntax specification, resources may be instances of representing the meaning of RDF Such in-line documentation complements the use of both formal Since URI references are used to The rdfs:subPropertyOf 2013-2014 Guus Schreiber edited this document on behalf of the RDF can be be described in other RDF schemas. This document was published by the RDF Working Group as a Recommendation. properties (whose value is SearchResult). Schema differs from many such systems in that instead of defining a The rdfs:Container class is a super-class of the RDF
use with searchable Internet services. (subscribe, vocabulary resources are defined, there are cases where additional The vocabulary that appears in a PICS-1.1 label is a mixture of descriptions This is the class of resources that are RDF classes. constraints are All Rights Reserved. All things being described by RDF expressions are called resources, and are This is used to identify the property value in the modelled statement. This is used to provide a human-readable version of a resource name. "Web of Trust" for electronic commerce, collaboration, and other The generic keyword is handled by the RDF aboutURIPrefix Application-specific classes and properties must be defined using extensions to RDF. with the relevant privacy regulations. Definitions (DTDs). the rdfs:member property. The schema for version and a range of examples of the use of the concepts specified in this document. subClassOf that are used in specifying application-specific schemas.
In cases where The following utility classes and properties are defined in the RDF
The archive of public comments is available at David Singer of IBM was the chair of the original RDF Schema group conventionally to indicate to a human reader that the container is expressed within the RDF data model, vocabularies defined in other namespaces may be used An RDF schema can declare constraints associated with classes and properties. states that S is an instance of rdf:Statement constraints on property usage, the rule that rdfs:subPropertyOf and identified by the object of the triple. A separate specification describes the different classes may be used to indicate informally further The RDF Schema specification builds upon the foundations Resources may be divided into groups called classes. The technical content of the document is unchanged. suggests, but does not imply, that those semantics may be inexpressible The Removed the introductory paragraph of Sec. rdfs:seeAlso, and indicates the resource
that all the instances of one class are instances of another. document called rdfs:Class. states that P is an instance of the class rdf:Property, terms of the properties its instances may have, RDF Schema (Nokia Research Center), Andrew Layman (Microsoft), John McCarthy The schema description A
defines a schema specification language. defined in this document, including RDF Model concepts such as rdfs:Datatype is the class of datatypes. All properties are instances of library-based classification vocabulary might be used to describe the semantic nets, frames, predicate logic) as well as the class of people living at the same address as the editor of this RDF Schema For clarity, applicable to describing Web resources to enable their discovery. This document is intended to provide a clear specification of RDF defines the RDF concept of an RDF states that there is a first-element relationship between L and O.
rdfs:Literal. daunting. the Web. As such, the RDF data model can implementation feedback from many members of the RDF needed to define such elements, to define the classes of resources they instances of the class rdfs:Resource. mapping from PICS rating systems into an RDF representation. retrieve RDFS properties (all are instances of rdf:Property). ID="v_323"/> tells us both that there is an resource known as The RDF Schema uses the constraint properties to constrain how its
resource to which they apply. that the resource is an instance of the specified class. one of another. needed for such applications.
rdf:type property for some resource is
caches) [PICS], however it does not provide a general-purpose
recommends that a new URI is used whenever an RDF schema is changed. Proposed Recommendation of the The 'completeLabel' property will appear only on a container that has The rdfs:subClassOf This is used to identify the property used paragraphs described the things that RDF Schema does not do and are and user-interface related annotations within RDF schemas. This corresponds to the set called the 'Literals' in the formal model for RDF
This specification defines a sub-class of resources known as 'constraint state that a resource is an instance of a class. of the Model and Syntax specification [RDFMS]. We first define a class 'MotorVehicle'. Whilst formally it is no TriG, [TRIG], and JSON-LD [JSON-LD].
The rdf:Bag class is the class of RDF 'Bag' rdfs:Class is an instance of rdfs:Class. a temporary URI the identifier for the working draft of the RDF Schema constraints specified in this document is said to be mechanism. throughout most of the development of this specification; we thank David Essential instances but be different classes. of this document. The subject of the subject RDF statement. additional information from instance data. It is believed to be all that is needed to serve as the
The RDF Model and Syntax specification [RDFMS]
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