farm-2.x-dev/modules/core/quantity/config/schema/quantity.schema.yml

quantity.settings:
  type: config_object
  label: 'Quantity settings'
  mapping:
    system_of_measurement:
      type: string
      label: 'System of measurement'
quantity.type.*:
  type: config_entity
  label: 'Quantity type'
  mapping:
    id:
      type: string
      label: 'Machine-readable name'
    label:
      type: label
      label: 'Type'
    description:
      type: text
      label: 'Description'
    new_revision:
      type: boolean
      label: 'Create new revision'