PREFIX : <http://hl7.org/fhir/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
BASE <http://instance.example/>

<Obs1>
  :status    "final" ;
  :subject   <Patient2> .

<Patient2>
  :name "Bob" ;
  :birthdate "1999-12-31"^^xsd:date .