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#
# Geolocate resource on a map given lat et long
#
prefix p: 
prefix o: 

template st:glocate {

  st:call-template(st:gmap, ?in, ?lat, ?lon, coalesce(us:places(?in), xt:list()))
  
}
where {

  ?in a o:Place 
  
  {select * where { 
  # let o:place first because limit 1
    { ?in o:place [ 
	p:longitude ?lon ;
	p:latitude  ?lat]   
    } 
    union
    {?in p:longitude ?lon ;
	 p:latitude  ?lat }     
  } limit 1}
    
}

# search all other Place resources   
function us:places(?in){
  let ((?list) = 
      select ?in (aggregate(xt:list(?res, ?lat, ?lon)) as ?list) 
      where {
        bind (st:get(st:dataset) as ?g)
	graph ?g {
	  ?res p:longitude ?lon ; p:latitude ?lat
	  filter kg:display(?res)
	  filter(?in != ?res)
	}
      })
      {?list}
}