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AIXM supports the encoding of schedules that contain both repetitive time periods and occasional occurrences. The coding guidelines for the ICAO Data Sets include general coding rules for Schedules [PWS]. These are also applicable to Digital NOTAM Events. However, more restrictive rules apply to NOTAM schedules, such as excluding the possibility to use 'HOL' and other special dates. These limitations lead to a smaller number of coding patterns for Digital NOTAM Event schedules, which are presented in this section.
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