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Query engine over QB4OLAP cubes

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QB4OLAP is a RDFS Vocabulary for Business Intelligence over Linked Data.

In this project we include a set of prototypes that conform a showcase of what can be done using this vocabulary, focusing on exploring and querying.

For querying we propose a high level OLAP language, called QL, which consists on a set of well-known operators: rollup, drilldown, slice, and dice. Using the cube metadata, also written using QB4OLAP, we automatically generate SPARQL queries to implement sequences of QL operations.