rexml_spec.rb

##
# HACKER: Dave Hoover
#
# AUTHORS: Geoffrey Grosenbach http://nubyonrails.com
#          Also http://p.ramaze.net/1887  
#
# RUN:
#   script/console
#   paste the following and make sure an exception is thrown

dom = REXML::Document.new('<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE member [
<!ENTITY a "&b;&b;&b;&b;&b;&b;&b;&b;&b;&b;">
<!ENTITY b "&c;&c;&c;&c;&c;&c;&c;&c;&c;&c;">
<!ENTITY c "&d;&d;&d;&d;&d;&d;&d;&d;&d;&d;">
<!ENTITY d "&e;&e;&e;&e;&e;&e;&e;&e;&e;&e;">
<!ENTITY e "&f;&f;&f;&f;&f;&f;&f;&f;&f;&f;">
<!ENTITY f "&g;&g;&g;&g;&g;&g;&g;&g;&g;&g;">
<!ENTITY g "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx">
]>
<member>
&a;
</member>')

dom.root.elements.to_a('//member').first.text