WordPress uses SimplePie for reading feeds, not for generating feeds. You’re looking at two different things here:
- You want to output your custom post meta in an RSS feed.
- You want to read that custom post meta somewhere else.
The first part is pretty easy. WordPress supports custom RSS feed templates. You can actually replace the standard RSS feed with a custom one that includes your custom post meta.
As for consuming the custom data, that is pretty straight-forward. SimplePie will read the RSS feed and create a feed object that includes everything that was in the XML file. Just work with it like you would any other object.
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