The program supports the addition or deletion of any attributes to each outline item, enabling link directories to be created by adding type and url attributes (screenshot).
It isn't as easy as using Radio, where you can hit CTRL-K or CMD-K to add a link to any title, but there may be a way to extend the functionality that I haven't found yet.
Note: JOE has the same problem with undeclared entity references as my OPML Link Publisher application: They break the document's XML well-formedness.
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