Related to #4 ...

Example:

If someone:

1. unzipped a compliant .csvz file, to a folder "MyData"
2. Ran tar -z "MyData" (Todo: correct syntax here to specify output name Eg MyData.csv.t.z ??)

...then what standards would this now comply with?

Suggestion: there could be an optional fragment

csvz-0-tz

...which also invites/allows other mutually exclusive 0 sub standards....

Csvz-0-t

... for a compliant tar that is not gzip'd

Csvz-O-7z

...for a compliant 7z file? (Details needed for such)