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A node is either a CNAME node or an "other data" node. A CNAME
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covering RRSIG rdatasets. An "other data" node contains any
rdataset other than a CNAME or RRSIG(CNAME) rdataset. When
changes are made to a node, the CNAME or "other data" state is
always consistent with the update, i.e. the most recent change
wins. For example, if you have a node which contains a CNAME
rdataset, and then add an MX rdataset to it, then the CNAME
rdataset will be deleted. Likewise if you have a node containing
an MX rdataset and add a CNAME rdataset, the MX rdataset will be
deleted.
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Node.__iter__c C sb t | j�dkrRt�|�}|tjkr6dd� | jD �| _n |tjkrRdd� | jD �| _| j�|� dS )a� Append rdataset to the node with special handling for CNAME and
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then all rdatasets other than KEY, NSEC, NSEC3, and their covering
RRSIGs are deleted. If the rdataset being appended has
``NodeKind.REGULAR`` then CNAME and RRSIG(CNAME) are deleted.
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�zNode._append_rdatasetF��rdclassr r �creater c C sH | j D ]}|�|||�r| S q|s*t�tj�|||�}| �|� |S )a* Find an rdataset matching the specified properties in the
current node.
*rdclass*, a ``dns.rdataclass.RdataClass``, the class of the rdataset.
*rdtype*, a ``dns.rdatatype.RdataType``, the type of the rdataset.
*covers*, a ``dns.rdatatype.RdataType``, 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.
*create*, a ``bool``. If True, create the rdataset if it is not found.
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*rdtype*, an ``int``, the type of the rdataset.
*covers*, an ``int``, 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
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co-exist with a CNAME, is a ``NodeKind.NEUTRAL`` node. The neutral
types are NSEC, NSEC3, KEY, and their associated RRSIGS. An empty node
is also considered neutral.
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or a neutral type is a a ``NodeKind.REGULAR`` node. Regular nodes are
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