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<text>Dave Winer's Outline</text>
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...which is pretty much what's going to happen. I have a working SAX2 filter for doing "inline" instant outlining of an OTLML 1.1 document and the new DTD is almost ready to be released. Right now the filter is hard-coded to munge remote OPML documents, but I plan on adding hooks to load (sub) filters on the fly based on the content-type attribute. Just not today.