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I too would like to use OmniOutliner and then port the results to LaTeX. As a temporary measure, I've written a command-line Objective-C application that uses the built-in XML processing of NSXMLDocument to parse an opml file, and then writes out a LaTeX documentclass report file with the various levels mapped to chapter, section, etc. down to subparagraph.

Usage is:
opml2latex input.opml output.tex

It is available at:
including source code, universal (I hope) executable, and a combination example and documentation file (in oo3 format).