in netnewswire - @brentsimmons allows us to add different feeds to one or more folders - and when you export and import - those folders travel in the import.

in feedland - @dave does essentially the same thing using tags

not sure which way @manton has gone

BUT it does seem that neither method seems to recognise the other

i wonder if that will change?

for what it is worth reeder uses folders

strikes me that if it doesn’t change the single canonical URL for an OPML is still not going to work - even if we do get the readers to read an URL - rather than importing and exporting all the time.