Dublin Core Metadata Initiative (DCMI)
The Dublin Core™ Metadata Initiative supports innovation in metadata design and best practices. DCMI is supported by its members and is a project of ASIS&T. Homepage: https://dublincore.org
This document is an up-to-date specification of all metadata terms maintained by the Dublin Core Metadata Initiative, including properties, vocabulary encoding schemes, syntax encoding schemes, and classes.
This document is an up-to-date, authoritative specification of all metadata terms maintained by the Dublin Core Metadata Initiative. Included are the fifteen terms of the Dublin Core Metadata Element Set, which have also been published as IETF RFC 5013, ANSI/NISO Standard Z39.85-2007, and ISO Standard 15836:2009.
This is the abstract model for Dublin Core™ metadata. The primary purpose of this vocabulaty is to specify the components and constructs used in Dublin Core™ metadata. It defines the nature of the components used and describes how those components are combined to create information structures. It provides an information model which is independent of any particular encoding syntax. Such an information model allows us to gain a better understanding of the kinds of descriptions that we are encoding and facilitates the development of better mappings and cross-syntax translations.
The Collection Description Accrual Method Vocabulary provides a set of terms that can be used as values of the
dct:accrualPolicy property in descriptions of collections. It has been developed in association with the Dublin Core Collections Application Profile (DC Collections AP) but this vocabulary is independent of that profile and the terms defined here may be referenced in other metadata descriptions and used as the values of other properties.
In statements in DC metadata descriptions, the URIs of the individual terms may be used as value URIs and/or the labels of the terms may be used as value strings.
The Dublin Core Metadata Element Set is a vocabulary of fifteen properties for use in resource description. The name “Dublin” is due to its origin at a 1995 invitational workshop in Dublin, Ohio; “core” because its elements are broad and generic, usable for describing a wide range of resources.
The fifteen element “Dublin Core” described in this standard is part of a larger set of metadata vocabularies and technical specifications maintained by the Dublin Core Metadata Initiative (DCMI). The full set of vocabularies, DCMI Metadata Terms, also includes sets of resource classes (including the DCMI Type Vocabulary, vocabulary encoding schemes, and syntax encoding schemes. The terms in DCMI vocabularies are intended to be used in combination with terms from other, compatible vocabularies in the context of application profiles and on the basis of the DCMI Abstract Model.
All changes made to terms of the Dublin Core Metadata Element Set since 2001 have been reviewed by a DCMI Usage Board in the context of a DCMI Namespace Policy. The namespace policy describes how DCMI terms are assigned Uniform Resource Identifiers (URIs) and sets limits on the range of editorial changes that may allowably be made to the labels, definitions, and usage comments associated with existing DCMI terms.
This document, an excerpt from the more comprehensive document DCMI Metadata Terms provides an abbreviated reference version of the fifteen element descriptions that have been formally endorsed in the following standards:
- ISO Standard 15836:2009 of February 2009 [ISO15836]
- ANSI/NISO Standard Z39.85-2012 of February 2013 [NISOZ3985]
- IETF RFC 5013 of August 2007 [RFC5013]
Since 1998, when these fifteen elements entered into a standardization track, notions of best practice in the Semantic Web have evolved to include the assignment of formal domains and ranges in addition to definitions in natural language. Domains and ranges specify what kind of described resources and value resources are associated with a given property. Domains and ranges express the meanings implicit in natural-language definitions in an explicit form that is usable for the automatic processing of logical inferences. When a given property is encountered, an inferencing application may use information about the domains and ranges assigned to a property in order to make inferences about the resources described thereby.
Since January 2008, therefore, DCMI includes formal domains and ranges in the definitions of its properties. So as not to affect the conformance of existing implementations of “simple Dublin Core” in RDF, domains and ranges have not been specified for the fifteen properties of the
dce: namespace (
http://purl.org/dc/elements/1.1/). Rather, fifteen new properties with “names” identical to those of the Dublin Core Metadata Element Set Version 1.1 have been created in the
dct: namespace (
http://purl.org/dc/terms/). These fifteen new properties have been defined as sub-properties of the corresponding properties of DCMES Version 1.1 and assigned domains and ranges as specified in the more comprehensive document DCMI Metadata Terms.
Implementers may freely choose to use these fifteen properties either in their legacy
dce: variant (e.g.,
http://purl.org/dc/elements/1.1/creator) or in the
dct: variant (e.g.,
http://purl.org/dc/terms/creator) depending on application requirements. The RDF schemas of the DCMI namespaces describe the subproperty relation of
dce:creator for use by Semantic Web-aware applications. Over time, however, implementers are encouraged to use the semantically more precise
dct: properties, as they more fully follow emerging notions of best practice for machine-processable metadata.