OS X programatically enumerate all metadata keys for a given folder

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For a given folder on a HFS+ volume on OS X, how do I enumerate all metadata keys (not just the ones used by spotlight/finder, which may be accessed via xattr or mdls) for a given folder programmatically? Either in Obj-C/Swift or Applescript/bash? I'm unable to find any info on that. Thanks!

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I see that "xattr" source is available on GitHub at https://github.com/xattr/xattr/tree/v0.6.2. It seems to be a combination of C and Python rather than the languages you name but you may be able to deduce the logic.