Examples from Norway:
https://github.com/entur/profile-norway-examples
Official schemas with examples:
https://github.com/NeTEx-CEN/NeTEx
Handbook for the Nordic NeTEx profile:
https://enturas.atlassian.net/wiki/spaces/PUBLIC/pages/728891481/Nordic+NeTEx+Profile
Handbook for the Nordic SIRI profile:
https://enturas.atlassian.net/wiki/spaces/PUBLIC/pages/637370420/Norwegian+SIRI+profile