The new version of OmniOutliner2OPML, v. 1.0.2, has been released. It now produces something that looks like conformant XML--attributes of an <outline> element are now within the base tag, and outline elements without children are closed inline with an "/>". If you have an OPML compatible application, I'd appreciate hearing if you can parse output from my script.

Stan Krute pointed me to his Java outliner that supports OPML, the Java Outline Editor (JOE). Looking at the OPML it produces, I realized I had the format wrong. A fix will come later today.