def get(name, default=None, aggregate=False, depth=-1, breakiface=None):
    """Acquire data from node.
        
        @param name: key of requested data.
        @param default: default return value.
        @param aggregate: Flag wether to aggregate requested value.
        @param depth: recurion depth. default ``-1`` is recurion until root.
        @param breakiface: ``zope.Interface`` defining the acquisition break
                           point.
        """
