librexml-ruby1.8 1.8.1+1.8.2pre4-1 (ia64 binary) in ubuntu hoary

pure Ruby non-validating XML parser supporting Namespaces, XPath
 REXML is a XML parser for Ruby written purely in Ruby so you don't
 need to install any binary libraries. It includes a DOM-like API
 which fits the Ruby-way of human-oriented programming much more than
 the DOM and a SAX-like streaming API. Additionally you can apply
 XPath-expressions to the tree. REXML also has support for
 XML-Namespaces.
 .
 This package provides REXML library for Ruby 1.8.