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Note that the concept of "weekday ranges" (such as "MON-WED") is also not supported in this specification because it does not have a direct mapping in the current AIXM model for Timesheets and because sometimes there are confusions between MON-FRI and "working days". However, the automatic NOTAM generation rules for item D ensure that a set of consecutive weekdays with a similar start/end time will generate a "weekday range", according to the OPADD recommendations. This does not exclude implementing an HMI that allows the input of weekday ranges, for efficiency reasons. They will have to be converted into individual weekday records in AIXM.
Finally, schedules in the form "from date & time" - "to date & time" (such as "MAR 02 09:00 - 09 16:00") are definitively not supported. This type of schedules do not fit easily in the Timesheet class of AIXM, because the startTime and endTime properties are, by definition, related only to day and/or dayTill. The AIXM definitions could be changed, but that would also change the meaning of the existing schedules, already encoded for AIXM 4.5 static data. Such semantic changes would significantly complicate the mapping between AIXM 4.5 and AIXM 5.1 data sources. It is also highly questionable if such schedules are really needed, as they can easily be seen as individual occurrences of similar Events.
UML class diagrams
The limitations identified above correspond to a subset of the general AIXM model for schedules. In the following diagram, classes and properties highlighted with orange color identify the part of the AIXM UML model which may be used for Digital NOTAM coding:
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