OptionalassetsDeclared assets bundled with the set.
OptionalattributionAttribution block (engine#90); absent means no attribution claim.
OptionalbookOptional set-level book block (title/author/url/asin).
Optionalcover_OptionaldescriptionOptionaldomainOptionallanguageLegacy pre-v1.2 key — the target language. Accepted as an
alias for target_language.
OptionalpathRepo-relative dir for the set's files (source-language tree,
e.g. sets/de/fr-a1). Falls back to sets/{id} when omitted.
Optionalreview_Three-state review standing (engine#94); absent means "authored".
Optionalsource_The language the learner already SPEAKS (card backs / notes / theory). Defaults to "en".
OptionaltagsOptionaltarget_The language the learner is LEARNING.
Optionaltitle_Optional title in the target language (native script).
OptionalvisibilityConsumer-display hint (#83). "hidden" keeps the set out of a
consumer app's learner-facing list; absent means "visible".
One
sets[]entry as it appears in a raw parsed manifest.