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• The message contents via message reflection. The channel will look for a field accessor matching the variable key component (e.g. a getSalesRegion() method) if the message supports message reflection.
• The key resolution table supplied to an AepEngine.send method or AepMessageSender.send method (if non null).
• The channel's key resolution table (if non null), which is a table that can be set on the channel programmatically for key resolution when handling an AepChannelUpEvent.
• The key resolution table supplied to an AepEngine.send method or AepMessageSender.send method (if non null).
• Default values encoded into the channel key itself. In the above example this would be 'US' for 'salesRegion'.

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