# Example 81  Not 2
# https://book.validatingrdf.com/bookHtml010.html#sec105

PREFIX :       <http://example.org/>
PREFIX schema: <http://schema.org/>
PREFIX xsd:    <http://www.w3.org/2001/XMLSchema#>

:User {
 schema:name      xsd:string ;
 schema:birthDate xsd:date? ;
}

:NoUser Not @:User