secDNS-1.1: use of only one form of interface

Hello,

I am seeking clarification on the following sentence from RFC 5910.

   The server MUST support the
   use of only one form of interface across all <secDNS:create>,
   <secDNS:update>, and <secDNS:infData> elements, except during a
   transition period, during which the server MAY support both.

We have one server (process) that provides an EPP interface for more
than one zone, each zone potentially having a different policy, i.e. one
policy may mandate Key Data whereas another policy may mandate DS Data.
Furthermore, I do not understand why one zone cannot have a policy that
gives registrants the choice of DS Data or Key Data for a domain. What
is the rationale for this requirement?

Regards,

James Mitchell

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