Yes, it would continue POSIX. But POSIX is about a small part of a linux distribution. There was LSB that was more extended, a bit. Then there was the file syst

Yes, it would continue POSIX. But POSIX is about a small part of a linux distribution. There was LSB that was more extended, a bit. Then there was the file system standard, and perhaps others that I don't know about. But a standard covering what one should expect from a modern 'base system', in full detail, updated every 10 or 5 years, does not exist. There is a de facto `standard', RHEL, but it is by fiat. A proper standard requires a documentation (the `standard') that defines what is essential to be found, _and_ an implementation--or, ideally, more than one, _and_ a means to check that a given implementation matches that documentation. If you have that documentation, it works both in space (alternative implementations) and time. In the future, you can be sure that a new implementation, perhaps of a future version of the standard, is still exactly compatible with the previous version. This has been done for languages (C, Ada, Lisp, Fortran etc), libraries and kernels (that is POSIX), processor ISAs, but not for linux distributions AFAIK.