The REST API Team (Bostjan Lah, Erik Sundvall, Sebastian Iancu, Heath Frankel, Pablo Pazos, and others on the SEC and elsewhere) have made a 0.9.0 Release of the ITS (Implementation Technology Specifications) component, in order to make a pre-1.0.0 release of the REST APIs available for wider comment.
This release is intended to be a 'core basics' foundation of APIs to build on, and some services like CDS, and more sophisticated querying (e.g. that Erik Sundvall has published in the past) will be added subsequently.
NOTE THAT IN THE 0.9.0 RELEASE, BREAKING CHANGES ARE POSSIBLE.
You can see the ITS Release 0.9.0 link here, while the links you see on the specs 'working baseline' page are the result of 0.9.0 plus any modifications made due to feedback. The .apib files are here in Github (see mainly the includes directory).
We are aiming to release 1.0.0 at the end of February, at which point the formal process kicks in.
Since we are in Release 0.9.0, the formal PR/CR process is not needed, and you can comment here. However, if you want to raise a PR you can, in which case, please set the Component and Affects Version fields appropriately: