Unclear what fields are mandatory vs optional

[dthaler]

For example in "dsi" in 9.1.5, is "tfwdata" mandatory or optional? The doc doesn't say.

I'd propose using a more formal description of the format, such as CDDL, which provides simple ways to specify what's mandatory, optional, etc. and also allows validation via tools.

For example, section 9.1.1 has:
"ocspdat": ["],
Notice the missing quote. This would be automatically detected if we allowed validation via a tool like can be done with CDDL.

[dthaler]

Another example is the "sdlist" field. If it contains 0 entries, must the field still be present?