<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def validate(self) : """validate the document"""

        self._store.validate()
        for pField in self.collection.arangoPrivates :
            self.collection.validatePrivate(pField, getattr(self, pField))