DTDs in Atom feed may break some readers

[Philip Kent]

The Atom feeds in Launchpad contain DTDs. It appears to include an XHTML DTD in the header making it appear to look similar to web page.

Some feed readers may not like feeds that contain DTDs and so choke on this. An example of one reader that suffers is Internet Explorer 7. This is important to fix as some users who may be getting interested with Launchpad and products that use it may be unable to subscribe to these feeds.

It seems the solution is to remove the DTD, and use other ways to process HTML formatted text in a message (such as content:encoded and CDATA).

[Edwin Grubbs (edwin-grubbs)]

It may be possible to tell IE7 to allow DTDs via javascript:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk/html/8a65b5b1-d62a-4b21-b599-4d7fa5b7a8d6.asp

It also would be possible to convert all named entities into their numerical form. For example,   would become  
http://www.w3.org/TR/html4/sgml/entities.html

[Edwin Grubbs (edwin-grubbs)]

Removed DTD and encoded the entities to make them valid xml.