@prefix bio: .
@prefix foaf: .
@prefix time: .
@prefix ex: .
@prefix thing: .
thing:maria
a foaf:Person ;
bio:condition thing:mariaUnmarried ;
bio:condition thing:mariaMarried .
thing:mariaUnmarried
foaf:name "Maria Smith" ;
time:start "1867" ;
time:end "1888" .
thing:mariaMarried
foaf:name "Maria Johnson" ;
time:start "1888" ;
time:end "9999" .