Named graph
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Named graphs are a key concept of Semantic Web architecture in which a set of Resource Description Framework statements (a graph) are identified using a URI, allowing descriptions to be made of that set of statements such as context, provenance information or other such metadata. Named graphs are a simple extension of the RDF data model through which graphs can be created but the model lacks an effective means of distinguishing between them once published on the Web at large.
Named graphs are a key concept of Semantic Web architecture in which a set of Resource Description Framework statements (a graph) are identified using a URI, allowing descriptions to be made of that set of statements such as context, provenance information or other such metadata. Named graphs are a simple extension of the RDF data model through which graphs can be created but the model lacks an effective means of distinguishing between them once published on the Web at large. @prefix foaf: . a foaf:Person . foaf:homepage . foaf:mbox . foaf:name "Joe Lambda" . This data has been written in a more verbose form than necessary to show the triple structures The homepage of the person with the email address can be obtained using the SPARQL query: PREFIX foaf: SELECT ?homepage FROM NAMED WHERE { GRAPH ?g { ?person foaf:homepage ?homepage . ?person foaf:mbox . } } The FROM NAMED here identifies the target graph for the query.
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