def sanitize(spec)
    spec.summary              = sanitize_string(spec.summary)
    spec.description          = sanitize_string(spec.description)
    spec.post_install_message = sanitize_string(spec.post_install_message)
    spec.authors              = spec.authors.collect { |a| sanitize_string(a) }

    spec
  end
#
Sanitize the descriptive fields in the spec.  Sometimes non-ASCII
characters will garble the site index.  Non-ASCII characters will
be replaced by their XML entity equivalent.