The first zip file contains the AIXM XML Schema files. These include the core AIXM Schema files as well as the Schemas for ISO 19136 and ISO 19139 and the AIXM Basic Message.
The second zip file contains the same files as the first. However, the annotations are included in the AIXM XML Schemas for those who need that information.
Donlon data set, Digital NOTAM samples, examples of individual feature encodings, etc. provided through the AIXM Wiki (www.aixm.aero/wiki)
AIXM 5.1: Supporting Documents
The supporting documents explain key parts of AIXM 5.1, for example, how the UML was converted to the XML schema. The Temporality Concept is probably the most important document in this section, as it explains the TimeSlice concept used by AIXM.