You have a default, unnamed namespace. This is a big annoyance in XML/XSL and may be causing your problem. All nodes without a namespace are in the Atom namespace, but its name is blank.
in reply to XML::LibXML's findnodes is beahving weirdly
I know how to get around it using XSL, but not with the module.
In XSL, you need to make up your own namespace and call it as an attribute of the stylesheet, like xmlns:whatever="http://www.w3.org/2005/Atom". As long as it matches the URL in the input, all your content is in the "whatever" namespace if another namespace isn't specified.
But like I say, that may not be the problem.
Nobody says perl looks like line-noise any more
kids today don't know what line-noise IS ...