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module: ietf-sid-file
   +--rw module-name?        yang:yang-identifier
   +--rw module-revision?    revision-identifier
   +--rw assigment-ranges* [entry-point]
   |  +--rw entry-point    comi:sid
   |  +--rw size           uint64
   +--rw items* [namespace identifier]
      +--rw namespace     enumeration
      +--rw identifier    union
      +--rw sid           comi:sid