Networked Knowledge Organization Systems
Dublin Core Application Profile
http://w3id.org/nkos Title Networked Knowledge Organization Systems Dublin Core Application Profile (NKOS AP) Description This file specifies the set of RDF classes and properties used in NKOS AP. Creator Contributor Described by Date Created 2014-04-03 Date Modified 2015-10-03 Version 0.2
Section 1. Introduction
This file specifies the set of RDF classes and properties used in the "Networked Knowledge Organization Systems Dublin Core Application Profile (NKOS AP)". The metadata schema can be used to describe knowledge organization systems/services (KOS) resources, such as thesauri, classification schemes, subject heading systems, taxonomies, and ontologies that are developed for organizing information and promoting knowledge management. The information about a KOS, including its data model, type, protocol, status, responsible body, available format, affectivity, and other descriptive data are very important to terminology registries, service registries, vocabulary users (machine or human), and retrieval systems. At a minimum level, metadata for KOS resources will describe specific characteristics of a KOS, facilitate the discovery of KOS resources, assist in the evaluation of such resources for a particular application or use, and facilitate sharing, reusing, and collaboration of the KOS resources.
This Dublin Core Application Profile for describing KOS resources is developed based on the work the Networked Knowledge Organization Systems (NKOS) group[http://nkos.slis.kent.edu/] members have done since 1998.
 For the types of KOS resources, consult NKOS-Types vocabulary.
Namespaces used by this AP
NKOS AP at a glance
This section is non-normative.
Classes dct:Agent , dct:AgentClass , adms:Asset , frbrer:Expression , dct:LinguisticSystem , frbrer:Manifestation , dct:MediaTypeOrExtent, dct:RightsStatement , frsad:Thema , frbrer:Work
nkos:alignedWith , nkos:basedOn , nkos:serviceOffered , nkos:sizeNote , nkos:updateFrequency , nkos:usedBy -reused: dct:audience , dcat:contactPoint , dct:created , dct:creator , wdrs:describedBy , dct:description , dct:format , dct:identifier , frbrer:isEmbodimentOf , dct:isPartOf , frbrer:isRealizationOf , dct:issued , dct:language , dct:modified , dct:publisher , dct:relation , dct:rights , adms:sample , dct:subject , dct: title , dct:type , prov:wasDerivedFrom
Attributes used for each term in this AP:
- Term name: A token appended to the IRI of a namespace to create the IRI of the term.
- IRI: The Internationalized Resource Identifier used to uniquely identify a term.
- Label: The human-readable label assigned to the term.
- Definition: A statement that represents the concept and essential nature of the term, taken from the original namespace.
- Comment: Additional information about the term or its application, taken from the original namespace.
- NKOS Usage Note:Additional information about the term or its application made by this AP, for NKOS use.
- Has Range: A Class of which a value described by the term is an Instance. Ranges are the objects of the statement (i.e. a subject-predicate-object RDF triple), or the expected value.
- Expected value: A further explanation of the range of properties such as an IRI/structured entity or literal/typed data.
- Has Domain: A Class of which a resource described by the term is an Instance. It indicates that a property applies to a particular class. Domains are the subjects of a statement (i.e. a subject-predicate-object RDF triple).
According to DCMI Terms http://dublincore.org/documents/dcmi-terms/
According to BIBFRAME Vocabulary http://www.loc.gov/bibframe/docs/vocab-conventions.html
Section 2. Re-used Classes
Agent Term Name dct:Agent IRI http://purl.org/dc/terms/Agent Label Agent Definition A resource that acts or has the power to act. Comment Examples of Agent include person, organization, and software agent.
Agent Class Term Name dct:AgentClass IRI http://purl.org/dc/terms/AgentClass/td> Label Agent Class Definition A group of agents. Comment Examples of Agent Class include groups seen as classes, such as students, women, charities, lecturers.
Asset Term Name adms:Asset IRI http://www.w3.org/ns/adms#Asset Label Asset Definition An abstract entity that reflects the intellectual content of the asset and represents those characteristics of the asset that are independent of its physical embodiment. Comment Assets can be versioned. Every time the intellectual content of an asset changes, the result is considered to be a new asset that can be linked to previous and next versions of the Asset. NKOS Usage Note This abstract entity combines the FRBR entities work (a distinct intellectual or artistic creation) and expression (the intellectual or artistic realization of a work) [ FRBR ].
Expression Term Name frbrer:Expression IRI http://iflastandards.info/ns/fr/frbr/frbrer/C1002 Label Expression Definition The intellectual or artistic realization of a work in the form of alpha-numeric, musical, or choreographic notation, sound, image, object, movement, etc., or any combination of such forms. NKOS Usage Note A particular version of the KOS, such as in a particular language or an abridgment.
Linguistic System Term Name dct:LinguisticSystem IRI http://purl.org/dc/terms/LinguisticSystem Label Linguistic System Definition A system of signs, symbols, sounds, gestures, or rules used in communication. Comment Examples include written, spoken, sign, and computer languages.
Manifestation Term Name frbrer:Manifestation IRI http://iflastandards.info/ns/fr/frbr/frbrer/C1003 Label Manifestation Definition The physical embodiment of an expression of a work. NKOS Usage Note Examples are: the printed edition of a thesaurus' 2010 English version, the SKOS Linked Data representation of the same version.
Media Type Term Name dct:MediaTypeOrExtent IRI http://purl.org/dc/terms/MediaType Label Media Type Definition A file format or physical medium.
Rights Statement Term Name dct:RightsStatement IRI http://purl.org/dc/terms/RightsStatement Label Rights Statement Definition A statement about the intellectual property rights (IPR) held in or over a Resource, a legal document giving official permission to do something with a resource, or a statement about access rights.
Thema Term Name frsad:Thema IRI http://iflastandards.info/ns/fr/frsad/C1001 Label Thema Definition Any entity used as a subject of a work. NKOS Usage Note A subject domain to which the KOS belongs. It can be a broad subject or any number of narrower subjects. Suggest to use a controlled vocabulary for those subjects.
Work Term Name frbrer:Work IRI http://iflastandards.info/ns/fr/frbr/frbrer/C1001 Label Work Definition A distinct intellectual or artistic creation. NKOS Usage Note Usually a KOS as a whole is a work, e.g., ASIS&T Thesaurus.
Aligned with Term Name fnkos:alignedWith IRI http://w3id.org/nkos#alignedWith Label Aligned With Definition A related resource with which the described resource is aligned. Has Domain Has Range Expected value IRI of an expression
Based on Term Name nkos:basedOn IRI http://w3id.org/nkos#basedOn Label Based On Definition A resource used as the source for a derivative resource. Has Domain Has Range Expected value IRI of a work
Service offered Term Name nkos:serviceOffered IRI http://w3id.org/nkos#serviceOffered Label Service Offered Definition Services provided to users for the described resources. Has Domain NKOS Usage Note Example: download, extract, query, annotation. Has Range Expected value literal
Size Note Term Name nkos:sizeNote IRI http://w3id.org/nkos#sizeNote Label Size Note Definition Number of concepts, terms, or other semantic units included in a KOS. Has Domain Has Range Expected value literal
Used By Term Name nkos:usedBy IRI http://w3id.org/nkos#usedBy Label Used By Definition Agent using the described KOS. Has Domain Has Range Agent Class Expected value IRI of an agent
Update Frequency Term Name nkos:updateFrequency IRI http://w3id.org/nkos#updateFrequency Label Update Frequency Definition The period in which a KOS is typically updated. Comment Suggest using DCMI Collection Description Frequency Vocabulary. (http://dublincore.org/groups/collections/frequency/) . Has Domain Has Range Expected value literal
Audience Term Name dct:audience IRI http://purl.org/dc/terms/audience Label Audience Definition A class of entity for whom the resource is intended or useful. Has Domain NKOS Usage Note Recommend using a controlled vocabulary. Has Range Expected value IRI of an agent class.
Contact Term Name dcat:contactPoint IRI http://www.w3.org/ns/dcat#contactPoint Label Contact Definition Links an asset to a contact point from where further information about an Asset can be obtained. Has Domain Has Range Expected value literal
Date Created Term Name dct:created IRI http://purl.org/dc/terms/created Label Date Created Definition Date of creation of the resource. Has Domain NKOS Usage Note Core element. For the date of a manifestation, use dct:issued Has Range Expected value literal
Creator Term Name dct:creator IRI http://purl.org/dc/terms/creator Label Creator Definition An entity primarily responsible for making the resource. Comment Examples of a Creator include a person, an organization, or a service. Has Domain NKOS Usage Note Core element Has Range Expected value IRI of an Agent
Described by Term Name wdrs:describedBy IRI http://www.w3.org/2007/05/powder-s#describedby Label Described by Definition The relationship A 'describedby' B asserts that resource B provides a description of resource A. Comment There are no constraints on the format or representation of either A or B, neither are there any further constraints on either resource. Has Domain Has Range Expected value IRI of a work; IRI of an expression
Description Term Name dct:description IRI http://purl.org/dc/terms/description Label Description Definition An account of the resource. Comment Description may include but is not limited to: an abstract, a table of contents, a graphical representation, or a free-text account of the resource. Has Domain Has Range Expected value literal
Format Term Name dct:format IRI http://purl.org/dc/terms/format Label Format Definition The file format, physical medium, or dimensions of the resource. Comment Examples of dimensions include size and duration. Recommended best practice is to use a controlled vocabulary such as the list of Internet Media Types [MIME] http://www.iana.org/assignments/media-types/. Has Domain Has Range Expected value literal
Identifier Term Name dct:identifier IRI http://purl.org/dc/terms/identifier Label Identifier Definition An unambiguous reference to the resource within a given context. Comment Recommended best practice is to identify the resource by means of a string conforming to a formal identification system. Has Domain NKOS Usage Note Core element Has Range Expected value identifier
Is embodiment of Term Name frbrer:isEmbodimentOf IRI http://iflastandards.info/ns/fr/frbr/frbrer/P2004 Label Is embodiment of Definition Relates a manifestation to an expression that is embodied in the manifestation. Has Domain NKOS Usage Note Core element Has Range Expected value IRI of an expression
Is Part Of Term Name dct:isPartOf IRI http://purl.org/dc/terms/isPartOf Label Is Part Of Definition A related resource in which the described resource is physically or logically included. Has Domain NKOS Usage Note A related KOS, in which the described KOS is logically included. This is different from nkos:basedOn relationship type. Consult KOS Relation Vocabulary for examples and possible extended properties http://wiki.dublincore.org/index.php/NKOS_Vocabularies . Has Range Expected value IRI of a work; IRI of an expression; IRI of a manifestation
Is Realization Of Term Name frbrer:isRealizationOf IRI http://iflastandards.info/ns/fr/frbr/frbrer/P2002 Label Is Realization Of Definition Relates an expression to the work that is realized through the expression. Has Domain NKOS Usage Note Core element Has Range Expected value IRI of a work
Date Issued Term Name dct:issued IRI http://purl.org/dc/terms/issued Label Date Issued Definition Date of formal issuance (e.g., publication) of the resource. Has Domain NKOS Usage Note Core element Has Range Expected value literal
Language Term Name dct:language IRI http://purl.org/dc/terms/language Label Language Definition A language of the resource. Comment Recommended best practice is to use a controlled vocabulary such as RFC 4646 [RFC4646]. Has Domain Has Range Expected value language code
Date Modified Term Name dct:modified IRI http://purl.org/dc/terms/modified Label Date Modified Definition Date on which the resource was changed. Has Domain Has Range Expected value literal
Publisher Term Name dct:publisher IRI http://purl.org/dc/terms/publisher Label Publisher Definition An entity responsible for making the resource available. Comment Examples of a Publisher include a person, an organization, or a service. Has Domain Has Range Expected value IRI of an agent
Relation Term Name dct:relation IRI http://purl.org/dc/terms/relation Label Relation Definition A related resource. Comment Recommended best practice is to identify the related resource by means of a string conforming to a formal identification system. Has Domain Has Range Expected value IRI of a work; IRI of an expression; IRI of a manifestation
Rights Term Name dct:rights IRI http://purl.org/dc/terms/rights Label Rights Definition Information about rights held in and over the resource. Comment Typically, rights information includes a statement about various property rights associated with the resource, including intellectual property rights. Has Domain Has Range Expected value rights statement
Sample Term Name adms:sample IRI http://www.w3.org/ns/adms#sample Label Sample Definition Links to a sample of an Asset (which is itself an Asset). Has Domain NKOS Usage Note A link to a fragment of the resource. Has Range Expected value IRI of an expression
Subject Term Name dct:subject IRI http://purl.org/dc/terms/subject Label Subject Definition The topic of the resource. Comment Typically, the subject will be represented using keywords, key phrases, or classification codes. Recommended best practice is to use a controlled vocabulary. Has Domain NKOS Usage Note Core element Has Range Expected value IRI of a thema
Title Term Name dct:title IRI http://purl.org/dc/terms/title Label Title Definition A name given to the resource. Has Domain NKOS Usage Note Core element Has Range Expected value literal
Type Term Name dct:type IRI http://purl.org/dc/terms/type Label Type Definition The nature or genre of the resource. Comment Recommended best practice is to use a controlled vocabulary. To describe the file format, physical medium, or dimensions of the resource, use the Format element. Has Domain NKOS Usage Note Has Range Expected value IRI of a KOS type
Derived From Term Name prov:wasDerivedFrom IRI http://www.w3.org/ns/prov#wasDerivedFrom Label Derived From Definition A derivation is a transformation of an entity into another, an update of an entity resulting in a new one, or the construction of a new entity based on a pre-existing entity. Has Domain NKOS Usage Note Derived From covers relationships between resources such as translation-of, abridgement-of, extension-of, and version-of. It is different from Part Of relationship type. Consult KOS Relation Vocabulary for examples and possible extended properties http://wiki.dublincore.org/index.php/NKOS_Vocabularies . Has Range Expected value IRI of an expression