query: SELECT DISTINCT 
  ?item ?itemLabel 
  
  #deprecated address stuff P696
  #?addressDep
  (GROUP_CONCAT(DISTINCT ?addressDep ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?DeprAddress)
  #?addressDepRef
  (GROUP_CONCAT(DISTINCT ?addressDepRef ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?DeprAddressRef)
  #?addressDepDate 
  (GROUP_CONCAT(DISTINCT ?addressDepDate ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?DeprAddressDate) 
  
  # current address stuff P6375
  #?address
  (GROUP_CONCAT(DISTINCT ?address ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?Address)
  #?addressRef
  (GROUP_CONCAT(DISTINCT ?addressRef ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?AddressRef)
  #?addressDate 
  (GROUP_CONCAT(DISTINCT ?addressDate ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?AddressDate) 
  
  #official website (P856) --> use as source of P6375
  #?off_website
  (GROUP_CONCAT(DISTINCT ?off_website ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?WebsiteOff)
  #?off_websiteRef
  (GROUP_CONCAT(DISTINCT ?off_websiteRef ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?WebsiteOffRef)
  #?off_websiteDate 
  (GROUP_CONCAT(DISTINCT ?off_websiteDate ; separator = " XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX ") as ?WebsiteOffDate) 
  
  WHERE 
  {
    ?item (p:P31/ps:P31) wd:Q28564,wd:Q11396180;wdt:P17 wd:Q55. 
    
    OPTIONAL {?item wdt:P969 ?addressDep .} #located at street address DEPRECATED(P969)
    OPTIONAL {?item p:P969 [prov:wasDerivedFrom [pr:P854 ?addressDepRef]] .}
    OPTIONAL {?item p:P969 [prov:wasDerivedFrom [pr:P813 ?addressDepDate]] .}
    
    OPTIONAL {?item wdt:P6375 ?address .} #located at street address (P6375)
    OPTIONAL {?item p:P6375 [prov:wasDerivedFrom [pr:P854 ?addressRef]] .}
    OPTIONAL {?item p:P6375 [prov:wasDerivedFrom [pr:P813 ?addressDate]] .}
    
    OPTIONAL {?item wdt:P856 ?off_website .} #official website (P856)
    OPTIONAL {?item p:P856 [prov:wasDerivedFrom [pr:P854 ?off_websiteRef]] .}
    OPTIONAL {?item p:P856 [prov:wasDerivedFrom [pr:P813 ?off_websiteDate]] .}
    
    SERVICE wikibase:label { bd:serviceParam wikibase:language "nl". }
  
  }
  GROUP BY ?item ?itemLabel 
  ORDER BY ASC(?item)
  