How do we balance the need for messages to be general enough for max interop, with the specificity needed to exploit the full power of an app?

Example 1. We might define a message that can load an image, but some applications are capable of loading several images at once.

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Messages might mean different things to different apps.

E.g. a 'loadImage' message might mean to render it for display to one app, plot its histogram to another, or stage it for processing to third. How do we deal with this in a user-friendly way?

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