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R1: obtaining relevant data by:
(i) ranking (a numerical value similar to PageRank), which determines the centrality of RDF documents and statements ),
(ii) via crowdsourcing [1,64]
R2: measuring the coverage (i.e. number of entities described in a dataset) and level of detail (i.e. number of properties) in a dataset to ensure that the data retrieved is appropriate for the task at hand