Unfortunately, this is considered an invalid feed per the spec:

RSS 2.0 adds that capability, following a simple rule. A RSS feed may contain elements not described on this page, only if those elements are defined in a namespace.

No namespace is specified on these elements. If there was a namespace specified, these items would be present in the feed.Extensions map.

I'm not sure what I could do to to handle these invalid feeds. Perhaps try and dump them into a special entry in the Extensions map, but I'm not sure.

In python i can handle this feed using https://github.com/kurtmckee/feedparser maybe you can follow the same idea

Let me take a look at what feedparser is doing for this case. Python's dynamic nature may be helping them.

So far, the only thing I can think of is adding these items to a special entry in the extension map.