DTD for feedlist OPML

[Danny Ayers <danny666@virgilio.it>]

Here's a DTD for feedlist OPML, along with instructions for its use :

http://semtext.org/wiki/index.php/OpmlDtd

This can improve interoperability between aggregators/newsreaders, but 
it depends on your cooperation.

If your exported OPML validates against this DTD then please add the 
name of your tool to the bottom of the page (it's on a Wiki), along with 
the date you checked.

Background :
Last time I got snarky about OPML and the incompatibility between the 
various ways different aggregator/newsreaders have interpreted the OPML 
spec for feedlists, a couple of folks suggested I compile a list of the 
way people were implementing it, to make translation possible. But XML 
already has a pretty reasonable route to compatibility - validation. 
This isn't really feasible with "full" OPML, as arbitrary attributes can 
appear. But for the specific task of carrying feedlists, this should be 
possible, so I've done a DTD based on the example in the "Guidelines for 
more powerful OPML". I may dislike OPML, but I'm all for interop ;-)

Cheers,
Danny.

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