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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A Semantic Pipe is a stored SPARQL query (or a sequence of queries) over one or more RDF sources. The result of each query is stored physically and seen as a concrete and independent RDF resource, anything that can be done to a real RDF resource can be done to it, except that it can only be updated by its query (i.e. based on it base resources.) The result of each query can be used as input to other queries. Semantic Pipes are close to Oracle s Materialized Views (used in data warehousing), which are static snapshots of the data and their accuracy depends on the trigger mechanize behind their updates. see MashQL