NeTEx and SIRI compatibility
NeTEx and SIRI are two European public transport data specifications that are comparable to GTFS and GTFS-RT but have a broader scope. Support for both was added by Entur in OTP version 2 and you can find examples of those in their examples repo.
Profiles
Nordic profile
Different countries are currently using different incompatible "profiles" of NeTEx, but an effort is underway to converge on a single European standard profile. This is based in large part on the Nordic profile used by Entur.
The Nordic profile is the only profile that has been thoroughly tested in production in OTP and is used in Norway, Finland and Sweden.
EPIP
The European Passenger Information Profile is an attempt to unify other country profiles and support in OTP is adequate, but it is difficult to tell how much of EPIP is supported since it is a very large profile. The current status of the support is tracked on Github.
Sometimes it is difficult to tell if a file conforms to EPIP so to find out, you can run the following commands:
git clone git@github.com:NeTEx-CEN/NeTEx-Profile-EPIP.git
xmllint --noout --schema NeTEx-Profile-EPIP/NeTEx_publication_EPIP.xsd your-filename.xml
Other profiles
It is the goal of the community to support both the Nordic profile and EPIP. If you have another profile, we encourage to get in touch with the community to find a way forward.