prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix dcat: <http://www.w3.org/ns/dcat#>
prefix dct: <http://purl.org/dc/terms/>
prefix skos: <http://www.w3.org/2004/02/skos/core#>

select distinct ?catalog ?catalogTitle ?dataset ?datasetTitle ?publisher
where {
?catalog rdf:type dcat:Catalog .
?catalog dct:title ?catalogTitle .
?catalog dcat:dataset ?dataset .
?dataset rdf:type dcat:Dataset .
?dataset dct:title ?datasetTitle .
?dataset dct:publisher ?publisher .
}