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In many applications one has to fetch and assemble pieces of information coming from more than one source for building a semantic warehouse offering more advanced query capabilities. In this paper we describe the corresponding requirements and challenges, and we focus on the aspects of quality and value of the warehouse. For this reason we introduce various metrics (or measures) for quantifying its connectivity, and consequently its ability to answer complex queries. We demonstrate the behaviordoi:10.4018/ijswis.2016070102 fatcat:ks2hdn2wmze6vpvr6lrie5dkzy