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Convert a node to text format.

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sFind an rdataset matching the specified properties in the
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        @param rdclass: The class of the rdataset
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        @param covers: The covered type.  Usually this value is
        dns.rdatatype.NONE, but if the rdtype is dns.rdatatype.SIG or
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        type the SIG/RRSIG covers.  The library treats the SIG and RRSIG
        types as if they were a family of
        types, e.g. RRSIG(A), RRSIG(NS), RRSIG(SOA).  This makes RRSIGs much
        easier to work with than if RRSIGs covering different rdata
        types were aggregated into a single RRSIG rdataset.
        @type covers: int
        @param create: If True, create the rdataset if it is not found.
        @type create: bool
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        @param rdclass: The class of the rdataset
        @type rdclass: int
        @param rdtype: The type of the rdataset
        @type rdtype: int
        @param covers: The covered type.
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Delete the rdataset matching the specified properties in the
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        @param rdtype: The type of the rdataset
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Replace an rdataset.

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        Ownership of the I{replacement} object is transferred to the node;
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