Get the first element and first child
xml = %{ <aquarium> <fish color="blue" size="small" /> <fish color="orange" size="large"> <fish color="green" size="small"> <fish color="red" size="tiny" /> </fish> </fish> <decoration type="castle" style="gaudy"> <algae color="green" /> </decoration> </aquarium>} require 'rexml/document' doc = REXML::Document.new xml doc.elements[1] # => <aquarium> ... </> doc.children[0] # => <aquarium> ... </>