SELECT *
WHERE { ?clsn a p2:Classification .
    ?clsn p2:hasClassifier pca-rdl:ERH00002 .
	?clsn p2:hasClassified ?rd .
}

SELECT *
FROM <http://www.reportinghub.no/refdata/1.0/npd>
WHERE { 
	?rd pca-rdl:hasDesignation ?des .
	OPTIONAL { ?rd a ?rdtype . }
	OPTIONAL { 
		?clsn p2:hasClassified ?rd .
		?clsn p2:hasClassifier ?cls .
	}
	OPTIONAL { ?rd rdfs:comment ?comment }
}