![]() ![]() "Dublin Core" is also used as an adjective for Dublin Core metadata, a style of metadata that draws on multiple Resource Description Framework (RDF) vocabularies, packaged and constrained in Dublin Core application profiles. ![]() The core properties are part of a larger set of DCMI Metadata Terms. The Dublin Core Metadata Initiative (DCMI), which formulates the DublinĬore, is a project of the Association for Information Science and Technology (ASIS&T), a non-profit organization. This fifteen-element Dublin Core has been formally standardized as ISO 15836, ANSI/NISO Z39.85, and IETF RFC 5013. The Dublin Core, also known as the Dublin Core Metadata Element Set (DCMES), is a set of fifteen "core" elements (properties) for describing resources. This property may be used to indicate an RDF vocabulary in which a resource is described.Logo image of DCMI, which formulates Dublin Core IsDefinedBy is an instance of Property that is used to indicate a resource defining the subject resource. SeeAlso is an instance of Property that is used to indicate a resource that might provide additional information about the subject resource. Label is an instance of Property that may be used to provide a human-readable version of a resource's name.Ĭomment is an instance of Property that may be used to provide a human-readable description of a resource. SubPropertyOf is an instance of Property that is used to state that all resources related by one property are also related by another. Hierarchies of classes support inheritance of a property domain and range from a class to its sub-classes: Properties are instances of the class Property and describe a relation between subject resources and object resources.įor example, the following declarations are used to express that the property "employer" relates a subject, which is of type "Person", to an object, which is of type "Organization": XMLLiteral – the class of XML literal values.XMLLiteral is an instance of Datatype (and thus a subclass of Literal). Each instance of:Datatype is a subclass of Literal. Datatype is both an instance of and a subclass of Class. Literals may be plain or typed.ĭatatype – the class of datatypes. Property values such as textual strings are examples of literals. Literal – literal values such as strings and integers. The other classes described by the RDF and RDFS specifications are: An instance of "Person" is a resource that is linked to the class "Person" using the type property, such as in the following formal expression of the natural language sentence: "John is a Person". All things described by RDF are resources.Ĭlass declares a resource as a class for other resources.Ī typical example of a Class is "Person" in the Friend of a Friend (FOAF) vocabulary. RDFS constructs are the RDFS classes, associated properties, and utility properties built on the limited vocabulary of RDF. Many RDFS components are included in the more expressive Web Ontology Language (OWL). The first version RDFS version was published by the World-Wide Web Consortium (W3C) in April 1998, and the final W3C recommendation was released in February 2004. These resources can be saved in a triplestore to reach them with the query language SPARQL. RDF Schema or RDFS is a set of classes with certain properties using the RDF extensible knowledge representation data model, providing basic elements for the description of ontologies, otherwise called RDF vocabularies, intended to structure RDF resources. This graph view is the easiest possible mental model for RDF and is often used in easy-to-understand visual explanations. This linking structure forms a directed, labeled graph, where the edges represent the named link between two resources, represented by the graph nodes. Using this simple model, it allows structured and semi-structured data to be mixed, exposed, and shared across different applications. RDF extends the linking structure of the Web to use URIs to name the relationship between things as well as the two ends of the link (this is usually referred to as a “triple”). RDF has features that facilitate data merging even if the underlying schemas differ, and it specifically supports the evolution of schemas over time without requiring all the data consumers to be changed. It is a standard model for data interchange on the Web. RDF stands for Resource Description Framework. Most used applications of Dublin Core Metadata are RDF and OWL. ![]() The Dublin Core Schema is a small set of vocabulary terms that can be used to describe different resources.ĭublin Core Metadata may be used for multiple purposes, from simple resource description, to combining metadata vocabularies of different metadata standards, to providing inter-operability for metadata vocabularies in the Linked data cloud and Semantic web implementations. ![]()
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