ZapTXT doesn’t allow you to import an external OPML, but you can import feeds and tag them.
This is aggregated into a tag cloud, when you click on a tag you will see feeds from a user-defined point of view, at this stage you can select feeds to build an OPML URL.
In the last post I mentioned that user-defined tags in a Reading List may be ineffective or detrimental…not due to users not being good indexers, but the problem of the task of re-indexing (how will users be notified that the content of a Reading List has changed, therefore their tags may be inaccurate, and will they care, or even worse will they even know, as they may have abandoned their accounts).
No solution yet
If you save another person’s Reading List it would be better to save a non-dynamic version, moreso (like feedbite), you would clone their Reading List, add any new feeds you like or delete existings feeds, and apply your own tags.
Now this has become your own Reading List, it lives at a different URL and has its own OPML URL.
But this still means that only one person is tagging a given Reading List, so I guess it still isn’t a folksonomy, it’s just a handy cloning feature.