Some examples of Akoma Ntoso 2.0 and 3.0 CSD03 documents are available at: http://examples.akomantoso.org/

For more updated examples in Akoma Ntoso 3.0 CSD13 see here:
https://tools.oasis-open.org/version-control/browse/wsvn/legaldocml/specs/draft/AkomaNtoso30-CSD13-D2f.zip?sc=1