PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>

SELECT
    ( STRLANG("abc", "en") AS ?term1 )
    ( STRLANG("abc", "") AS ?term2 )
    ( STRLANG(123, "en") AS ?term3 )
    ( STRLANG(<http:/example/x> , "en") AS ?term4 )
WHERE {}
