Double portraits

double_portraits.sparql

PREFIX crm: <http://www.cidoc-crm.org/cidoc-crm/>
PREFIX dcmitype: <http://purl.org/dc/dcmitype/>
PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
PREFIX nm: <http://nomisma.org/id/>
PREFIX nmo: <http://nomisma.org/ontology#>
PREFIX org: <http://www.w3.org/ns/org#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

SELECT DISTINCT ?object ?title ?type ?p1 ?p2 WHERE {
  ?type a nmo:TypeSeriesItem ;
          nmo:hasObverse ?obv.
  ?obv nmo:hasPortrait ?p1, ?p2 filter ( ?p1 != ?p2 ) .
  ?p1 a foaf:Person .
  ?p2 a foaf:Person .
  ?object nmo:hasTypeSeriesItem ?type ;
          dcterms:title ?title    
}