Parasites are a mechanism for attaching arbitrary binary data to an image or
so they will support just about anything you can imagine. The main thing to
about is compatibility: if you want your plug-in to generate persistent
read them later, the process needs to work on every platform, and future
your plug-in should not break if they are applied to images that contain
generated by earlier versions. This "future backward compatibility"
principle is what
usually calls for the most thought.
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