I use NetVibes, and have recently tried to export my feeds as OPML, and noticed that it generates invalid OPML. The OPML 2.0 spec states:

A missing text attribute in any outline element is an error. 

NetVibes’ <outline> elements look something like this:

<outline
    title="Netvibes Blog"
    type="rss"
    xmlUrl="http://feeds.feedburner.com/NetvibesDevBlog"
    htmlUrl="http://blog.netvibes.com"/>  

It’s very easy to fix – just add a new “text” attribute with the contents of the existing “title” attribute. It trips up some other OPML importers, though.

[Edit: I wrote a little python script to fix this problem specifically: opml-fix-text-attr.py]

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