@prefix :      <http://example.org/ns#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .

:x :p 20.5 .

:x 
    :p "23.0"^^xsd:float .
    #:p 23.0 .

:x :p 29 .

:x :p 9 .