= DNS/terminology/Glue_records =
について、ここに記述してください。

glue の由来も書かれている。[[/sibling_domain]]

DNS Glue RR Survey and Terminology Clarification
https://tools.ietf.org/html/draft-koch-dns-glue-clarifications-03#page-4

https://tools.ietf.org/html/draft-koch-dns-glue-clarifications-05  March 9, 2015

Domain registry APIs and "superglue" - Tony Finch's blog https://fanf.livejournal.com/145708.html  
----
https://tools.ietf.org/html/rfc8499

The terminology used by implementers and developers
   of DNS protocols, and by operators of DNS systems, has sometimes
   changed in the decades since the DNS was first defined. 

This document gives current definitions for many of the terms used in the DNS in a single document.

定義というより、最新の用法を並べたものだと理解する。-- ToshinoriMaeno <<DateTime(2019-01-09T11:21:03+0900)>>


https://twitter.com/OrangeMorishita/status/691475722620133376

.@tss_ontap_o RFC 7719とその更新のI-D（draft-ietf-dnsop-terminology-bis-00）には、sibling {domain,glue}は書かれていませんでした。
13:20 - 2016年1月25日 
----
draftからの引用　(あやしげな記述も)

== Glue ==
   Glue records:  
"[Resource records] which are not part of the
      authoritative data [of the zone], and are address resource records
      for the [name servers in subzones].  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."  Without glue "we could be faced
      with the situation where the NS RRs tell us that in order to learn
      a name server's address, we should contact the server using the
      address we wish to learn." 
 (Definition from [RFC1034], Section 4.2.1)

A later definition is that glue "includes any record in a zone
      file that is not properly part of that zone, including nameserver
      records of delegated sub-zones (NS records), address records that
      accompany those NS records (A, AAAA, etc), and any other stray
      data that might appear" (Quoted from [RFC2181], Section 5.4.1).
      Although glue is sometimes used today with this wider definition
      in mind, the context surrounding the [RFC2181] definition suggests
      it is intended to apply to the use of glue within the document
      itself and not necessarily beyond.

== Bailiwick ==
   Bailiwick:  "In-bailiwick" is an adjective to describe a name server
      whose name is either a subdomain of or (rarely) the same as the
      origin of the zone that contains the delegation to the name
      server.  In-bailiwick name servers may have glue records in their
      parent zone (using the first of the definitions of "glue records"
      in the definition above).  (The term "bailiwick" means the
      district or territory where a bailiff or policeman has
      jurisdiction.)

      "In-bailiwick" names are divided into two type of name server
      names: "in-domain" names and "sibling domain" names.

      *  In-domain: an adjective to describe a name server whose name is
         either subordinate to or (rarely) the same as the owner name of
         the NS resource records.  An in-domain name server name MUST
         have glue records or name resolution fails.  For example, a
         delegation for "child.example.com" may have "in-domain" name
         server name "ns.child.example.com".

      *  Sibling domain: a name server's name that is either subordinate
         to or (rarely) the same as the zone origin and not subordinate
         to or the same as the owner name of the NS resource records.
         Glue records for sibling domains are allowed, but not
         necessary.  For example, a delegation for "child.example.com"
         in "example.com" zone may have "sibling" name server name
         "ns.another.example.com".

      "Out-of-bailiwick" is the antonym of in-bailiwick.  An adjective
      to describe a name server whose name is not subordinate to or the
      same as the zone origin.  Glue records for out-of-bailiwick name
      servers are useless.  Following table shows examples of delegation
      types.