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Semagrow exposes a SPARQL endpoint that federates a number of heterogeneous data sources, also exposed as SPARQL endpoints. The main difference between Semagrow and most existing distributed querying solutions is that Semagrow targets the federation of heterogeneous and independently provided data sources. In other words, Semagrow aims to offer the most efficient distributed querying solution that can be achieved without controlling the way data is distributed between sources and, in general, without having the responsibility to centrally manage the data sources of the federation.