#example.sparql
#==============

PREFIX wgs: <http://www.w3.org/2003/01/geo/wgs84_pos#>
PREFIX q: <http://qrowd-project.eu/ontology/>
CONSTRUCT {
  GRAPH eg:myGraph {
    ?s
      a q:BikeStation ;
      q:id ?id ;
      rdfs:label ?name ;
      wgs:long ?x ;
      wgs:lat ?y ;
      .
  }
}
{
  # url:text is a property function that fetches the content of subject URL and
  # makes it available as a SPARQL result set row via the object variable
  <https://raw.githubusercontent.com/QROWD/QROWD-RDF-Data-Integration/master/datasets/1014-electric-bikesharing-stations/trento-bike-sharing.json> url:text ?src .
  BIND(json:parse(?src) AS ?json) .

  # Unnest each item of the json array into its own SPARQL result set row
  ?json json:unnest ?i .

  # For each row, craft the values for the CONSTRUCT template
  BIND("http://qrowd-project.eu/resource/" AS ?ns)

  BIND(json:path(?i, "$.id") AS ?id)
  BIND(URI(CONCAT(?ns, ENCODE_FOR_URI(?id))) AS ?s)
  BIND(json:path(?i, "$.name") AS ?name)
  BIND(json:path(?i, "$.position[0]") AS ?x)
  BIND(json:path(?i, "$.position[1]") AS ?y)
}