Experimenting with OPML sounds a little like something high-school kids might do behind the gym. Nevertheless, many bloggers, podcasters and others are testing out the new format, because it complements the standard format for newsfeeds, RSS.
Podcasters interested in experimenting with OPML can now validate their OPML files with developer Dave Winer's new OPML Validator.
OPML (Outline Processor Markup Language) is an XML format designed for sharing outlines of information. The OPML specification defines an outline as a hierarchical, ordered list of arbitrary elements.
Enter a URL in the OPML validator, and the validator will check to see if it conforms to the OPML spec and the OPML Validation Guidelines.
"Because it's a beta, you shouldn't depend on the results," notes Winer.
