Removes the factvalue for the given factvalue identifier
        @type factvalue_id: string
        @param factvalue_id: the factvalue identifier to be removed

def remove_this_factvalue(self,factvalue_id):
        """
        Removes the factvalue for the given factvalue identifier
        @type factvalue_id: string
        @param factvalue_id: the factvalue identifier to be removed
        """
        for fact in self.get_factvalues():
            if fact.get_id() == factvalue_id:
                self.node.remove(fact.get_node())
                break