Reannotate text document

Dear All,

I have question about the current practice of automatic semantic annotation,
like MnM, Ontomat, Annotea and KIM, we know that they can automatically
annotate document, 

a) if we have a document then it is been annotated by these tools, then at
one time that document evolves to a new version, do the new version of
document will need to reannotate either manually or automatically?

Thanks.
Sunny8

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