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

ex:Cat {
  a ["Cat"] ;
  ex:name xsd:string ;
  ex:age xsd:integer ;
  ex:numberOfHomes xsd:integer ;
  ex:address {
    ex:street xsd:string ;
    ex:houseNumber xsd:string ;
    ex:floor xsd:integer
  }
}