oracle xml question

9.2.0.5

Any one know how to figure out how many nodes there might be in an xmltype column

ex
xmltype column will have
order

   suborder
   suborder
   suborder
   could be one or more suborders - theoretically no limit order

I need to find a way to know how many suborders there might be in order to generate a select using extract to display it for users.

thanks

Mike

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