OptionalbasisOptionalerrorThe error behind note, for a caller that wants to rethrow it — a UsageError
for a count asked in a way the upstream cannot answer. Not serialisable: leave
it out of JSON.
Records the corpus holds for the source's parliament (all Länder for an aggregator).
Optionalmissingupstream - in_corpus, never below zero; absent without upstream.
OptionalnoteWhy upstream is absent.
Absent for an aggregator, which counts every Land it covers.
OptionalupstreamWhat the upstream says it holds; absent when it could not be asked (note says why).
Where
upstreamcomes from: "DIP numFound", "Parlamentsspiegel".