On Wed, Feb 25, 2015 at 12:26:39AM +0000,
 Edward Lewis <edward.le...@icann.org> wrote 
 a message of 139 lines which said:

> I’ve never heard the other terms, have no idea what they’d mean (out
> of context).

I'm not sure they appear in a RFC. They are commonly used (see for
instance <https://mex.icann.org/ar/file/22921/download/23075>) when
discussing resolvers' behaviour.

Let me suggest:

Child-centric resolver: a DNS resolver which will replace, in its
memory, the NS RRset and glue records obtained from the parent, by
data from the authoritative servers of the zone they belong to. This
is the proper behaviour.

Parent-centric resolver: a DNS resolver which will keep in memory the
NS RRset and glue records obtained from the parent, despite the fact
it is non-authoritative. This is bad practice.

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