PREFIX : <http://example/> 

CREATE GRAPH <http://example/graph>

INSERT DATA { :r :p 123 } 
INSERT DATA { :r :p 1066 }

DELETE DATA { :r :p 1066 }


INSERT DATA INTO <http://example/graph>
{ :r :p 123 . :r :p 1066 }
DELETE DATA FROM <http://example/graph>  { :r :p 123 }