'Create a new rdataset of the specified class and type.
@see: the description of the class instance variables for the
meaning of I{rdclass} and I{rdtype}'

def __init__(self, rdclass, rdtype, covers=dns.rdatatype.NONE):

    super(Rdataset, self).__init__()
    self.rdclass = rdclass
    self.rdtype = rdtype
    self.covers = covers
    self.ttl = 0
