'Initialize a zone object.
@param origin: The origin of the zone.
@type origin: dns.name.Name object
@param rdclass: The zone\'s rdata class; the default is class IN.
@type rdclass: int'

def __init__(self, origin, rdclass=dns.rdataclass.IN, relativize=True):

    self.rdclass = rdclass
    self.origin = origin
    self.nodes = {}
    self.relativize = relativize
