How many different affiliations do the authors of 'A model-driven framework for ETL process development' have?
Count the different affiliations of the authors of 'A model-driven framework for ETL process development'.
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/dolap/AkkaouiZMT11> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/conf/dolap/AkkaouiZMT11>