Syntax definitions for OPML (Outline Processor Markup Lang)?

[David Haslam]

Does anyone have a Textpad syntax definitions file for OPML (Outline Processor Markup Language)?

Outline Processor Markup Language (OPML) is a format for storing outlines (such as those produced by any of several popular outliners for personal computers) in XML. Each outline is represented as a tree, where each node contains a set of named attributes with string values. The purpose of the format is to provide a way to exchange information between outliners and Internet services that can be browsed or controlled through an outliner.

I already looked under O section of the syntax add-ons page of the Textpad.com website, but OPML wasn't listed there. Nor is it among any of the various XML syntax definition files.