Formless annotate.Text: how to change rows and cols values ?

I've neither found any mails concerning this topic into the mail archive,
neither into the list of defects (in trac).

Does any one can explain me how to update the default rows (=8) and cols
(=40) values of an anotate.Text() ?

As example, I'm using the following Fromless class to rend a simple textarea.

class IUpdatePage(annotate.TypedInterface):
    def updatePage(self,
         content=annotate.Text(label="Content :",description="Enter here
the REST type content")):
            pass
    updatePage=annotate.autocallable(updatePage)

Thanks

PS:

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William: http://www.opensource4you.com