# filename: ex491.rq

PREFIX ab: <http://learningsparql.com/ns/addressbook#> 
PREFIX nn: <http://learningsparql.com/new/namespace/>

CONSTRUCT 
{
  ?personURI ab:firstName ?fn ;
             ab:lastName ?ln ;
             ab:email ?email ;
             ab:homeTel ?tel .
}
WHERE {
  ?person ab:firstName ?fn ;
          ab:lastName ?ln ;
          ab:email ?email . 
  OPTIONAL {
    ?person ab:homeTel ?tel .
  }
  BIND(ENCODE_FOR_URI(CONCAT(?fn,?ln)) AS ?encodedName)
  BIND("http://learningsparql.com/new/namespace/" AS ?baseURI)
  BIND(URI(CONCAT(?baseURI,?encodedName)) AS ?personURI)
}