gistfile1.txt

=== FIRST QUERY ===

PREFIX  dc:   <http://purl.org/dc/terms/>

DELETE WHERE
{
  <> dc:title ?o0 .
} ;
INSERT DATA {
  <> dc:title "Stuff" .
}

=== SECOND QUERY ===
=== FIRST TIME YOU RUN THIS YOU'LL GET BOTH TITLES INSTEAD OF UPDATING ===
=== RUN A SECOND TIME AND IT WORKS FINE ===

PREFIX  dc:   <http://purl.org/dc/terms/>

DELETE WHERE
{
  <> dc:title ?o0 .
  <> dc:author ?o1 .
} ;
INSERT DATA {
  <> dc:title "Things" .
  <> dc:author "Danny" .
}