Linked data
Linked Open Data (LOD ) refers to the World Wide Web freely available data, which are identified by Uniform Resource Identifier ( URI) and may be also obtained directly via HTTP and also refer by URI to other data. Ideally, the Resource Description Framework (RDF), upon which standards such as SPARQL and the Web Ontology Language (OWL ) can be used for coding and linking of data so that Linked Open Data at the same time is part of the Semantic Web. The linked data provide a global network, which is also known as " Linked [ Open] Data Cloud " or "Giant Global Graph". There, where the emphasis is less on the free usability of the data as with free content ( Open Data ), the term Linked Data is common.
Idea of open networked data
Open networked data are all data sets that are made in the public interest of the company without any restriction, free to use, for redistribution and for free further use of freely accessible and interconnected via the World Wide Web.
Basic concept
While the WWW is a network of websites, the purpose of Linked Open Data, a network of data arise, which can be used together automatically from multiple sources (information integration). The concept of Linked Open Data is mainly due to Tim Berners Lee, who suggested the name "Giant Global Graph" ( GGG) and the end of 2007. He coined four rules for Linked Data:
" 1 Use URIs as names for things 2 Use HTTP URIs so did people can look up Those names. 3 When someone looks up a URI, Provide useful information, using the standards (RDF, SPARQL ) 4 Include links to other URIs, so thatthey can discover more things. "
" 1 Use to designate objects URIs. 2 Use HTTP URIs so that it is possible to look up the labels. 3 out relevant information ready when someone looks up a URI (using the standards RDF and SPARQL ). 4 This information includes in particular links to other URIs, can be discovered through other objects. "
A popular account of the Linked Open Data cloud was created in October 2007 and has since been updated several times. For example, it contains the data sets of DBpedia and GeoNames.