BIND 10 #926: Possibility to specify variable keys for map in configuration

[BIND 10 Development]

#926: Possibility to specify variable keys for map in configuration
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                   Reporter:         |                 Owner:  UnAssigned
  vorner                             |                Status:  reviewing
                       Type:         |             Milestone:
  enhancement                        |  Sprint-20110802
                   Priority:  major  |            Resolution:
                  Component:         |             Sensitive:  0
  configuration                      |           Sub-Project:  Core
                   Keywords:         |  Estimated Difficulty:  7.0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  jelte => UnAssigned
 * status:  assigned => reviewing


Comment:

 I've named the new 'type' a 'named set', because it is essentially a list
 that does not use indices, but names; the idea is that we will be able to
 configure and use things like
 {{{/some_module/zones/example.com/master 1.2.3.4}}}
 instead of
 {{{/some_module/zones[1]/master 1.2.3.4}}}

 internally, it's passed as a map, just like 'normal' maps (which have
 fixed names as specified in the spec file). This one has variable names,
 but one fixed type for its values. This has the end result of behaving
 more like the lists we have now than the maps we have now. But since it's
 indexed by name, in effect it behaves like sets where the items are
 addressable. So i've chosen the name 'named set' instead of 'named map'
 which sounds like a tautology (and plain 'map' was obviously already
 taken, and 'dict' or 'hash' would be even more confusing imo).

 While I was adding support for this, I have also fixed another issue
 (about out-of-bound list adressing, #1080, but we'd need to see in that
 ticket whether all cases have been covered now).

 The actual use of this is not visible yet, we'd need to add some setting
 somewhere or change some current settings, which would be a good thing for
 another ticket (as we may need to do config version bumping and/or
 compatibility then). One obvious one might be Xfrin/zones.

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Ticket URL: <http://bind10.isc.org/ticket/926#comment:6>
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