How to use RevalidatingDOMParser?

[Michel Benhamou]

I tried the validate method of a RevalidatingDOMParser
on a node but it doesn'work.
It seems that the fCurrentContentSpecType field used in
the checkContent method of DTDValidator class is set to -1
instead of the correct value corresponding to the node. I guess
there must be some initialising code necessary before calling validate.
Can anyone help?