More information about all releases of Akoma Ntoso see here:

1. from Akoma Ntoso 2.0 to Akoma Ntoso 3.0 CSD08, including all schema and the differences between releases: http://examples.akomantoso.org/schema-releases.html

2. for navigating the technical documentation of Akoma Ntoso 3.0 CSD13: http://sinatra.cirsfid.unibo.it/XSDocViewer/

3. for downloading the updated XML-schema of Akoma Ntoso 3.0 CSD13:
https://tools.oasis-open.org/version-control/browse/wsvn/legaldocml/specs/draft/AkomaNtoso30-CSD13-D2f.zip?sc=1