SELECT distinct 
		po.project, 
		po.contactperson,
		po.startdate,
		po.enddate,
		po.inferred,
		po.deletedbyinference,
		po.trust,
		po.inferenceprovenance,
		'contactperson@@@contactperson@@@dnet:project_organization_relations@@@dnet:project_organization_relations'	as semantics
		
FROM project_organization po
LEFT OUTER JOIN persons p on (p.id = po.contactperson)

WHERE po.contactperson is not null AND (p.firstname is not null OR p.secondnames is not null)