PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX fn: <http://www.w3.org/2005/02/xpath-functions#>
SELECT *
WHERE {
  ?a ?b ?c.
  fn:a fn:b fn:c
  FILTER(?a = "string literal")
  FILTER(?b = 123)
  FILTER(?c = 123.4)
  FILTER(?a = <http://something/>)
}
