REST API Format

REST API Format

Hi!
 
We are wondering which format if that is the case will be the road ahead when setting up API integration with other systems.
Input Format 1 or format 2?
Which input format is the on prefered one?

"Note: Please note that the Input and Output XML formats have been changed. But for compatibility reasons, the Input operation will support both the formats. "

Best regards,
Jay

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