construct_wd_links_extract.rq

# Create Wikidata items with PM20 id or linked
# via GND or GeoNames from PM20
#
PREFIX gndo: <https://d-nb.info/standards/elementset/gnd#>
PREFIX hint: <http://www.bigdata.com/queryHints#>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX zbwext: <http://zbw.eu/namespaces/zbw-extensions/>
#
construct {
  ?wd wdt:P4293 ?pm20Id ;
    wdt:P227 ?gndId ;
    wdt:P1566 ?geoId .
}
where {
  hint:Query hint:optimizer "None" .
  #
  # get item data
  {
    ?wd wdt:P4293 ?pm20Id .
## TODO
## does not work because endpoint (with https:) is not allowed
#  } union {
#    service <https://zbw.eu/beta/sparql/pm20/query> {
#      ?s gndo:gndIdentifier ?gndId .
#    }
#    ?wd wdt:P227 ?gndId .
#  } union {
#    service <https://zbw.eu/beta/sparql/pm20/query> {
#      ?s zbwext:geoIdentifier ?geoId .
#    }
#    ?wd wdt:P1566 ?geoId .
  }      
}