traces.sparql

#defaultView:Graph
SELECT ?item ?itemLabel ?image ?linkTo ?edgeLabel WHERE {
  
  # hypertext systems
  { { ?item wdt:P31 wd:Q65966993 } UNION { ?item wdt:P279 wd:Q65966993 } }
  
  # first date
  OPTIONAL { { ?item wdt:P571 ?date } UNION { ?item wdt:P580 ?date } UNION { ?item wdt:P585 ?date } UNION { ?item wdt:P577 ?date } }  
  FILTER NOT EXISTS {
    {  { ?item wdt:P571 ?date2 } UNION { ?item wdt:P580 ?date2 } UNION { ?item wdt:P585 ?date2 } UNION { ?item wdt:P577 ?date2 } }
    FILTER (?date > ?date2)
  }
  
  # links
  OPTIONAL { 
    { 
      { ?item wdt:P155 ?linkTo BIND(wd:P155 AS ?edge) } 
      UNION 
      { ?item wdt:P941 ?linkTo BIND(wd:P941 AS ?edge) } 
      UNION 
      { ?item wdt:P144 ?linkTo BIND(wd:P144 AS ?edge) } 
      UNION 
      { ?item wdt:P737 ?linkTo BIND(wd:P737 AS ?edge) } 
    }
    
    { { ?linkTo wdt:P31 wd:Q65966993 } UNION { ?linkTo wdt:P279 wd:Q65966993 } }
  }
  
  # image and short name
  OPTIONAL { ?item wdt:P18 ?image }  
  OPTIONAL { ?item wdt:P1813 ?short }
  
  SERVICE wikibase:label {
    bd:serviceParam wikibase:language "en" .
    ?item rdfs:label ?label .
    ?edge rdfs:label ?edgeLabel .
  } .
  BIND(CONCAT(IF(BOUND(?short),?short,?label),": ", STR(YEAR(?date))) AS ?itemLabel) .
}