Users who use xattrs for many different purposes are likely to want to preserve some xattrs but not others.  Thus, it would be nice to have a name-based hide/protect filtering system for xattrs just like the ones for files.  Filters could be specified with an --xattr-filter option; I see no need to add corresponding syntactic-sugary --xattr-{in,ex}clude{,-from} options.

For example, if src/ has been indexed by Beagle and I want to copy it to dest/, copying over all xattrs except the Beagle ones, I could run:

rsync -aX --xattr-filter='H user.Beagle.*' src/ dest/