@prefix foaf:       <http://xmlns.com/foaf/0.1/> .
@prefix eg:         <http://biometrics.example/ns#> .
@prefix xsd:        <http://www.w3.org/2001/XMLSchema#> .

_:a  foaf:name       "alice".
_:a  eg:shoeSize     "9.5"^^xsd:float .

_:b  foaf:name       "bob".
_:b  eg:shoeSize     "42"^^xsd:integer .