BIND 10 #525: handle "singleton" RR types

[BIND 10 Development]

#525: handle "singleton" RR types
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           Reporter:  jinmei         |                      Owner:  jinmei
               Type:  enhancement    |                     Status:  new
           Priority:  major          |                  Milestone:  feature
          Component:  DNSPacket API  |  backlog item
          Sensitive:  0              |                   Keywords:
Add Hours to Ticket:  0              |  Estimated Number of Hours:  0
        Total Hours:  0              |                  Billable?:  1
                                     |                  Internal?:  0
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 Some types of RRs are "singleton", i.e., only one RR of such type
 can exsit in the RRset for the <owner, type, class> tuple.

 It would be useful to provide an API that takes an RR type and returns
 if it's singleton or not.

 It may also make sense to modify RRset::addRdata() so that it rejects
 adding more than one RDATA for single types of RRs.

 See also Trac #504.

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Ticket URL: <http://bind10.isc.org/ticket/525>
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