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Semantic Web

The Semantic Web is an international effort to bring machine-readable data to the web called linked data and was started by Sir Tim Berners-Lee, the inventor of the world-wide-web. Linked Data is based on a RDF (Resource Description Framework) graphs made up a series of statements, called triples, that take the form subject - predicate - object.

Libraries standards are shifting to Linked-Data vocabularies like BIBFRAME and Schema.org. RDA and MARC can also be reformulated into Linked Data triples as well.

Subjects

A subject resource can be:
  • IRI
  • Blank Node

Predicates

A relationship between the subject and object is called a property.

A predicate must be an IRI.

Objects

An object resource can be
  • IRI
  • Blank Node
  • Literal

Freddie Blevins Oral History

To describe the Freddie Blevins oral history from Colorado College's collection of interviews with women from the Western Slope, a simple RDF metadata graph of this audio object is presented below. https://digitalcc.coloradocollege.edu/islandora/object/coccc:2478 at this IRI (International Resource Identifier). IRIs identifies a resource with URLs being the most common form of an IRI.

RDF Graph in Turtle Format

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema: <http://schema.org/> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://digitalcc.coloradocollege.edu/islandora/object/coccc:2478> a schema:AudioObject ;
    schema:creator [ a schema:Person ;
            schema:givenName "Freddie" ;
            schema:name "Freddie White Blevins" ] ;
    schema:dateCreated "1984-09-27" ;
    schema:duration "01:40:00" ;
    schema:familyName "Blevins" .
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