[Rails] XML behaviour issue

I am trying to parse both rss feed and atom feed using Nokogiri. I'm
meeting a problem where i cannot use one query to universally select
both rss element and atom element.

E.g.

@item = "item"
root.xpath(//#{@item}) will select for rss
@item = "entry"
root.xpath(//#{@item}) will not select for rss

Even though the entry tag has no explicit namespace attached to it. I
understand this is an implicit namespace issue which is in the xml
specifications. However, I am wondering if there's a way to circumvent
this issue to allow nokogiri to somehow modify the document so that the
xpath on implicitly namespaced element would work without a namespace.
Thanks!

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