of the edge, and the last and third element (the object) either the name of the node where the edge ends or a literal value (e.g. a text, a number, etc.). _:a <https://www.w3.org/1999/02/22-rdf-syntax-ns#type> <https://schema.org/Person> . _:a <https://schema.org/name> "Paul Schuster" . _:a <https://schema.org/birthPlace> <https://www.wikidata.org/entity/Q1731> . <https://www.wikidata.org/entity/Q1731> <https://schema.org/itemtype> <https://schema.org/Place> . <https://www.wikidata.org/entity/Q1731> <https://schema.org/name> "Dresden" . The triples result in the graph shown in the given figure. One of the advantages of using Uniform Resource Identifiers (URIs) is that they can be dereferenced using the HTTP protocol. According to the so-called Linked Open Data principles, such a dereferenced URI should result in a document that offers further data about the given URI. In this example, all URIs, both for edges and nodes (e.g. , , ) can be dereferenced and will result in further RDF graphs, describing the URI, e.g. that Dresden is a city in Germany, or that a person, in the sense of that URI, can be fictional. The second graph shows the previous example, but now enriched with a few of the triples from the documents that result from dereferencing (green edge) and (blue edges). Additionally to the edges given in the involved documents explicitly, edges can be automatically inferred: the triple _:a <https://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> . from the original RDFa fragment and the triple <https://schema.org/Person> <http://www.w3.org/2002/07/owl#equivalentClass> <http://xmlns.com/foaf/0.1/Person> . from the document at (green edge in the figure) allow to infer the following triple, given OWL semantics (red dashed line in the second Figure): _:a <https://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://xmlns.com/foaf/0.1/Person> . Background The concept of the semantic network model was formed in the early 1960s by researchers such as the cognitive scientist Allan M. Collins, linguist M. Ross Quillian and psychologist Elizabeth F. Loftus as a form to represent semantically structured knowledge. When applied in the context of the modern internet, it extends the network of hyperlinked human-readable web pages by inserting machine-readable metadata about pages and how they are related to each other. This enables automated agents to access the Web more intelligently and perform more tasks on behalf of users. The term "Semantic Web" was coined by Tim Berners-Lee, the inventor of the World Wide Web and director of the World Wide Web Consortium ("W3C"), which oversees the development of proposed Semantic Web standards. He defines the Semantic Web as "a web of data that can be processed directly and indirectly by machines". Many of the technologies proposed by the W3C already existed