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sHDNS rdatasets (an rdataset is a set of rdatas of a given type and class)i����NtDifferingCoverscBseZdZRS(s�Raised if an attempt is made to add a SIG/RRSIG whose covered type
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�Zd�Zd�Zddedd�Zddded�Zd�ZRS(s�A DNS rdataset.

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    dns.rdatatype.NONE, but if the rdtype is dns.rdatatype.SIG or
    dns.rdatatype.RRSIG, then the covers value will be the rdata
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    types, e.g. RRSIG(A), RRSIG(NS), RRSIG(SOA).  This makes RRSIGs much
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        @param name: If name is not None, emit a RRs with I{name} as
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        @param compress: The compression table to use; the default is None.
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