In particular in the context of the discussion on enabling major version transitions https://github.com/ivoa/major-version-transition a facility would really handy by which services could send warnings to clients; these would, for instance, be raised as python warnings in pyVO, dumped to stderr by clients like stilts or shown in some non-modal way in aladin.
The main use case from a transition perspective would be pushing messages like "this interface will close in 2027; migrate to this other interface until then". But of course this would also be useful in, say, TAP services to warn users doing clearly unwise things that just might be on purpose (but probably are not).
I'd say an INFO with a name of "warning" (case-sensitive) might do. And we could describe it right after the errors subsubsection (i.e., a new 5.4.3, making the additional information 5.4.4).
I'd be happy to provide a PR if there's rough consensus.
In particular in the context of the discussion on enabling major version transitions https://github.com/ivoa/major-version-transition a facility would really handy by which services could send warnings to clients; these would, for instance, be raised as python warnings in pyVO, dumped to stderr by clients like stilts or shown in some non-modal way in aladin.
The main use case from a transition perspective would be pushing messages like "this interface will close in 2027; migrate to this other interface until then". But of course this would also be useful in, say, TAP services to warn users doing clearly unwise things that just might be on purpose (but probably are not).
I'd say an INFO with a name of "warning" (case-sensitive) might do. And we could describe it right after the errors subsubsection (i.e., a new 5.4.3, making the additional information 5.4.4).
I'd be happy to provide a PR if there's rough consensus.