cd40
  - isochrone: MetadataSource
    > MetadataSource, "schema": 0 +metadata +schema
    > GeoJsonSource, "geojson": 3 +metadata
    ~ IsochroneTransformer: 3 -> 6 +metadata
    ~ GeomUnionTransformer: 6 -> 2 +metadata
    ~ EndDateTransformer: 2 +metadata
    ~ MetadataMerge: 2 +metadata +schema
    ~ SanitizeTagsTransformer: 2 +metadata +schema
    ~ ValidateTransformer: 2 +metadata +schema
    ~ RefsIntegrityTransformer: 2 +metadata +schema
    < GeoJson: isochrone: +metadata
    < GeoJson: geojson: 2
    < GeoJson: isochrone: +schema
  - Conflate metadata
    > MetadataSource, nil: 0 +metadata +schema +i18n
    < GeoJson: : +metadata
    < GeoJson: : +schema
    < GeoJson: : +i18n