module ietf-schedule {
  yang-version 1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-schedule";
  // replace with IANA namespace when assigned
  
  prefix "sch";

  import ietf-yang-types { 
    prefix "yang"; 
  }

  organization "TBD";
  contact "TBD";
  description 
    "The model allows time scheduling parameters to be specified.";
  
  revision "2015-10-08" {
    description "Initial revision";
    reference "TBD";
  }

  /*
   * Groupings
   */

  grouping schedules {
    description
      "A list of schedules defining when a particular 
       configuration takes effect.";
    container schedules {
      list schedule {
        key "schedule-id";
        description "A list of schedule elements.";
        
        leaf schedule-id {
          type uint32;
          description "Identifies the schedule element.";
        }
        leaf start {
          type yang:date-and-time;
          description "Start time.";
        }
        leaf schedule-duration {
          type string {
            pattern 
              'P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?(\d+S)?';
          }
          description "Schedule duration in ISO 8601 format.";
        }
        leaf repeat-interval {
          type string {
            pattern 
              'R\d*/P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?'
              + '(\d+S)?';
          }
          description "Repeat interval in ISO 8601 format.";
        }
      }
    }
  } // schedules
}