'Lists bunch of directories efficiently.
Args:
urn: Urn to list children.
token: Security token.
limit: Max number of children to list.
age: The age of the items to retrieve. Should be one of ALL_TIMES,
NEWEST_TIME or a range.
Returns:
RDFURNs instances of each child.'

def ListChildren(self, urn, token=None, limit=None, age=NEWEST_TIME):

    (_, children_urns) = list(self.MultiListChildren([urn], token=token, limit=limit, age=age))[0]
    return children_urns
