There are a number of different key/value pair groups, which can be added to a rail to change its appearance and/or extend its functionality:
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Logo (RAIL) key/value pair group – defines how brand logos are applied within a rail
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Logo (Content) key/value pair group – defines how brand logos are applied to the items within a rail
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Android Channels API key/value pair group – serves as a marker indicating that the content for this rail should be sourced dynamically using the Android Channels API
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PromotionalBanner key/value pair group – a visually prominent content item intended for promotional purposes
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Internal Image key/value pair group – indicates to the client this is a group containing information for an image accessed via the platform’s ImageService
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External Image key/value pair group – indicates to the client this is a group containing information for an externally-hosted image accessed via a URL