How should a spectrum status be used? about proxi-schemas

[jjcarver]

My interpretation is that any record returned in the query corresponds to at minimum a file that is present on disk. So a status of "PEAK UNAVAILABLE" does not mean the same thing as a 404. A 404 means the MS run (i.e. file) isn't there at all. Any record returned, regardless of status, is by definition not a 404.

In the case of peak list files in open format (e.g. mzML) we can easily read the file to verify that the requested spectrum is indeed present and extract its peaks. This is what I interpret a status of "READABLE" to mean. The file is there AND we can validate/extract the actual spectrum from it.

However, sometimes a spectrum query/USI matches a raw file, which we can technically "read" in a file system sense but which we cannot (at least easily) open up to extract the actual spectrum. This is what "PEAK UNAVAILABLE" means. The MS run you asked for is there, we assume the specific spectrum you asked for may be in that file, but we can't actually give you its peaks.

I am honestly not sure if this is the best interpretation. But this is how I read the current specification.

[ypriverol]

the PEAK UNAVAILABLE was instroduced by @nuno because is something needed in MassIVE when the usi is there but they can't read the mzML because of RAW file conversion problem or other types of issues.