Introduction
As explained in the data encoding section, this specification supports the encoding of three types of schedules:
- daily schedules, e.g. "daily from 09:00 to 17:00";
- date based schedules, e.g. "1/10 09:00-15:00 and on 3/10 10:00-12:00";
- weekday based schedules, e.g. "every Monday from 13:00 to sunset";
This section provides rules for the automated decoding of the AIXM 5.1 Event Schedule data in text format. For most Event Scenarios, this textual schedule description is provided in item D of the generated NOTAM. However, if the Event concerns the modification of a baseline schedule, then the new/temporary schedule has to be provided in item E. This is identified in the particular scenarios concerned. The ICAO DOC 8126 and the OPADD rules have been followed in the definition of the text schedule production rules.
Decoding rules
AIXM specific terms are used in this section, such as names of features and properties. The abbreviation TS. indicates that the corresponding data item must be taken from the Timesheet(s) of the TEMPDELTA or PERMDELTA TimeSlices created for the feature associated with the Event, as indicated for each particular scenario.
Annotations shall be translated into free text according to the Encoding annotations rules and included in item E. No schedule annotations should be included in item D.
- Note for developers: Python code implementing the decoding rules of this section is available from Eurocontrol. However, it shall be considered as a prototype implementation, not as code to be used directly in end products!
The first step is the identification of the schedule type.
| Reference | Rule |
|---|---|
| (1) | If there are TS.Timesheet elements that do not have excluded='YES' and that have TS.startDate and TS.endDate empty or not present, then follow the algorithm described by Production rule Daily. |
| (2) | If there are TS.Timesheet elements that do not have excluded='YES' and that have TS.startDate and TS.endDate not empty, then follow the algorithm described by Production rule Dates. |
| (3) | If there are TS.Timesheet elements that do not have excluded='YES' and that have TS.day containing different from 'ANY', then follow the algorithm described by Production rule Weekdays. |