[enum-wg] Help with enum docs

Hello, list!

I'm very new in enum and need some help in docs understanding.

I can't understand following parts of rfc 3403:

   "Collision Avoidance:
      In the case where two Applications may use this Database (which is
      actually the case with the ENUM and URI Resolution Applications,
      Section 6.2), there is a chance of collision between rules where
      two NAPTR records appear in the same domain but they apply to more
      than one Application."

And

"      *  create a new zone within the domain in common that contains
         only NAPTR records that are appropriate for the application.
         E.g., all URI Resolution records would exist under
         urires.example.com and all ENUM records would be under
         enum.example.com.  In the case where this is not possible due
         to lack of control over the upstream delegation the second
         method is used."

Could someone provide me with examples of such collision and its resolution?


Thanks in advance.

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AP