April 2016
Intermediate to advanced
294 pages
6h 57m
English
Content preview from Identification and Management of Distributed Data
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RDF Query Language: SPARQL
Whereas Resource Description Framework (RDF) statements can be thought of as a graph or collection of graphs, querying RDF means to be able to detect portions of those graphs matching given patterns. RDF has its own query language, SPARQL, which provides a rich set of capabilities for this purpose.
Triple Patterns and Query
SPARQL patterns are expressed using a syntax similar to SQL but which is based on the concept of triple patterns. Triple patterns are similar to RDF triples except that each subject, object, and predicate in a triple pattern may be a variable.
A given pattern matches a portion of a graph, or subgraph, if and only if a graph equivalent to that subgraph may be obtained by substituting the ...
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