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Resource Description Framework (RDF)

Resource Description Framework (RDF). RDF is a data modelling framework for describing “resources” A “resource” can be anything at all Resources have unique identifiers called Uniform Resource Identifiers (URI). Resources. Two kinds of resources in RDF: Information resources

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Resource Description Framework (RDF)

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  1. Resource Description Framework (RDF) • RDF is a data modelling framework for describing “resources” • A “resource” can be anything at all • Resources have unique identifiers called Uniform Resource Identifiers (URI)

  2. Resources Two kinds of resources in RDF: Information resources Web pages, videos, etc. Things you can download off the web. Non-information resources People, abstract concepts, places, types of relationships between things, etc)

  3. RDF “triples” • RDF is made out of “triples” • Triples link two things (subject and object) together, via a third thing (a “predicate”) • The things are either: • “resources” identified by a “URI” • “literal” values such as numbers, pieces of text, dates, etc.

  4. :Work On Our Selection title On Our Selection (1912) is a theatrical adaptation of On Our Selection! (1899). abstract

  5. RDF “graphs” • A collection of triples is a “graph” • “Graph” is used in a specific sense: • a set of nodes, connected together by lines • = a “network”

  6. XML (Extensible Markup Language) • RDF is an abstract model • RDF graphs can be “serialized” using a variety of syntaxes • XML syntax is commonly used for serializing RDF

  7. <?xml version="1.0" encoding="UTF-8"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcterms=“http://purl.org/dc/terms/” xmlns:dc=“”> <rdf:Descriptionrdf:about=“http://www.austlit.edu.au/run?ex=ShowWork&workId=C1@)”> <dc:title>On Our Selection</dc:title> <dcterms:abstract>On Our Selection (1912) is a theatrical adaptation of On Our Selection! (1899)</dcterms:abstract> </rdf:Description> </rdf:RDF>

  8. Alternate syntaxes e.g. Turtle @prefix austlit: <http://www.austlit.edu.au/run?ex=ShowWork&workId=> austlit:C1@) dc:title "On Our Selection”; dcterms:abstract "On Our Selection (1912) is a theatrical adaptation of On Our Selection! (1899)”.

  9. RDF “ontologies” • An ontology is essentially a formalised technical vocabulary • Described using RDF Schema & Web Ontology Language (OWL) • Each term in the vocabulary is a “resource”, and an ontology is usually published as a graph of those resources. • Vocabularies may themselves be standardised • e.g. Dublin Core • There are bibliographic ontologies, biographical ontologies, scientific, geographic, etc, etc.

  10. Linked Data - the technique • Linked Data is a technique for publishing RDF as graphs on the WWW. • Some of the URIs in an RDF graph refer to information resources; you can retrieve those resource in your browser. • You can't, however, download a person or a concept. • If you try to download a non-information resource from a Linked Data web server, it will redirect you an information resource (which could be an RDF graph, for instance), that contains information about that non-information resource. • An exploratory, “follow your nose” technique for discovering data

  11. Linked Data – the principles • Use URIs for identifiers • Use de-referenceable HTTP URIs (rather than URNs) • Use semantic web standards (e.g. RDF, SPARQL) • Include links to related resources to create a ‘web of data’

  12. Linked Open Data - the movement • Linked Open Data is a growing movement • More and more data custodians are publishing in this way • Breaks down silos and allows interlinking • Third parties can enhance others' datasets • Third parties can link others' datasets together • Collaboratively building a Linked Data Cloud!

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