caf40
  - event: MetadataSource
    > MetadataSource, "event": 0 +metadata +tags_schema +natives_schema +i18n
Invalid URL: website=www.moun40.fr
    > GristSource, "event": 4 +metadata +natives_schema +i18n
    ~ DerivatedTagTransformer: 4 +metadata +schema +i18n
    ~ OsmTags: 4 +metadata +schema +i18n
    ~ GpxTransformer: 4 +metadata +schema +i18n
    ~ EndDateTransformer: 4 +metadata +schema +i18n
    ~ MetadataMerge: 4 +metadata +schema +i18n
    ~ SanitizeTagsTransformer: 4 +metadata +schema +i18n
    ~ ValidateTransformer: 4 +metadata +schema +i18n
    ~ ValidateAttributionTransformer: 4 +metadata +schema +i18n
    ~ ValidateReportIssueTransformer: 4 +metadata +schema +i18n
    ~ RefsIntegrityTransformer: 4 +metadata +schema +i18n
    < GeoJson: event: +metadata
    < GeoJson: event event: 4
    < GeoJson: event: +tags_schema
    < GeoJson: event: +natives_schema
    < GeoJson: event: +i18n
  - Conflate metadata
    > MetadataSource, nil: 0 +metadata +tags_schema +natives_schema +i18n
    < GeoJson: : +metadata
    < GeoJson: : +tags_schema
    < GeoJson: : +natives_schema
    < GeoJson: : +i18n
  - Revalidate
    > GeoJsonTagsNativesSource, "event": 4 +metadata +tags_schema +natives_schema +i18n
    ~ ValidateTransformer: 4 +metadata +schema +i18n
    < GeoJson: : +metadata
    < GeoJson:  event: 4