Prophecy wording prophecy wording - why repeat it it? How to contain it?

[Ravenclaw Bookworm]

No: HPFGUIDX 128167


Kathy writes:
I have a question. How can the Keeper of Prophecies just decide
what a prophecy means, or who it affects, on his own and just
change the prophecy orb to relate to a specific person? Does the
Wizengamot make the decision? Could he have made a mistake?????

Bookworm:
That was my first thought when Dumbledore told Harry that the Keeper 
had changed the designation.  Just to confuse matters, a few lines 
later, Dumbledore says "I'm afraid there's not mistake" (or something 
like that).  So the next question is: why is Dumbledore so sure?

Ravenclaw Bookworm