aixm/donlon ? reverse-engineered prompt

Build me a clean little repository for the Donlon fictitious aviation data set in AIXM 5.1.1.

I want it to hold the sample AIS XML files for the AIP data set, obstacle data, temporality examples, and digital NOTAM examples, with a simple way to keep them organized and easy to reuse. Please include clear README text that explains this is entirely fictional, must never be used as operational data, and that the files are meant as reference examples for AIXM temporality and Digital NOTAM coding.

If it helps, add basic scripts or examples for extracting the separate data sets from a combined master XML file, and make sure the structure is easy for someone to browse and understand. Keep the focus on documentation, sample data, and maintainability, not on building a big application. If you need to check the latest AIXM or Digital NOTAM guidance online, go ahead and do that.