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This is a sample entry:
<outline type="rss" text="RSS Feed Title" title="RSS Feed Title" description="RSS Feed Description" xmlUrl="http://www.somedomain.com/rss.php?no=4711" htmlUrl="http://www.somedomain.com/page.php?no=4711" category="/Cat/SubCat" language="en-us" />
I didn't find information on a 'categories' attribute with standard delimiters (doh! I know ... arrays/lists should not be used in normalized structures) nor a sample of multiple instances of category in sub-outlines or so.
Usually folks create a OPML file per category, but in my example this would result in unwanted duplicates.
Any ideas? TIA!