class AvailabilityQuery(
  cohort: Cohort,
  uuid: str,
  owner: str,
  collection: str,
  protocol_version: str,
  char_salt: str,
)

to_dict() -> dict:

from_dict(dict_: dict):

class DistributionQuery(
  owner: str,
  code: DistributionQueryType,
  analysis: str,
  uuid: str,
  collection: str,
)

to_dict() -> dict:

from_dict(dict_: dict):