xml_parse_into_struct() fails on all forms of RSS?

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I did a little test to learn about how xml_parse_into_struct() works
and I find, to my surprise, that it fails to work at all with two
different versions of RSS. But it works with an Atom feed just fine.

Go look at this page:


You can see the output here:


You'll note that the where the print_r() is, the Atom feed is turned
into an array, but both versions of RSS that I'm testing here come up
completely empty. Why is that?

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