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s�A DNS node.

    A node is a set of rdatasets

    @ivar rdatasets: the node's rdatasets
    @type rdatasets: list of dns.rdataset.Rdataset
objectst	rdatasetsc

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Convert a node to text format.

        Each rdataset at the node is printed.  Any keyword arguments
        to this method are passed on to the rdataset's to_text()
method.
        @param name: the owner name of the rdatasets
        @type name: dns.name.Name object
        @rtype: string
       
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sFind an rdataset matching
the specified properties in the
        current node.

        @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.  Usually this value is
        dns.rdatatype.NONE, but if the rdtype is dns.rdatatype.SIG or
        dns.rdatatype.RRSIG, then the covers value will be the rdata
        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
        @raises KeyError: An rdataset of the desired type and class does
        not exist and I{create} is not True.
        @rtype: dns.rdataset.Rdataset object
       
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        current node.

        None is returned if an rdataset of the specified type and
        class does not exist and I{create} is not True.

        @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.
        @type covers: int
        @param create: If True, create the rdataset if it is not found.
        @type create: bool
        @rtype: dns.rdataset.Rdataset object or None
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Delete the rdataset
matching the specified properties in the
        current node.

        If a matching rdataset does not exist, it is not an error.

        @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.
        @type covers: int
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Replace an rdataset.

        It is not an error if there is no rdataset matching I{replacement}.

        Ownership of the I{replacement} object is transferred to the node;
        in other words, this method does not store a copy of I{replacement}
        at the node, it stores I{replacement} itself.
        sreplacement is not an rdatasetN(t
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