Hi.

  In http://www.ietf.org/id/draft-hoffman-dns-terminology-02.txt,
  "glue" is defined as follows.

   Glue records -- Resource records which are not part of the
   authoritative data, and are address resource records for the servers
   listed in the message.  They contain data that allows access to name
   servers for subzones.  (Definition from RFC 1034, section 4.2.1)

  Reference to "the message" seems to be a distraction here.  The
  cited source defines (and motivates) glue records, in a section
  which specifies "[t]he data that describes a zone", as follows

   [...] a zone contains "glue" RRs which are not
   part of the authoritative data, and are address RRs for the servers.
   These RRs are only necessary if the name server's name is "below" the
   cut, and are only used as part of a referral response.

  I think that placing the definition of glue in the scope of "the
  message" rather than in that of the zone data is likely to lead to
  confusion.

  Best regards,
  Niall O'Reilly
  

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