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isUnlabelledFallback

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > isUnlabelledFallback

This can be marked 'true' to indicate that some published DeliveryTimeSettings or ShippingRateSettings are intended to apply to all OfferShippingDetails published by the same merchant, when referenced by a shippingSettingsLink in those settings. It is not meaningful to use a 'true' value for this property alongside a transitTimeLabel (for DeliveryTimeSettings) or shippingLabel (for ShippingRateSettings), since this property is for use with unlabelled settings.
Values expected to be one of these types
Boolean
Used on these types
DeliveryTimeSettings
ShippingRateSettings

Source

https://github.com/schemaorg/schemaorg/issues/2506