# File temp/element.rb, line 1133
    def prefixes
      ns = []
      each_attribute do |attribute|
        ns << attribute.name if attribute.prefix == 'xmlns'
      end
      if @element.document and @element.document.doctype
        expn = @element.expanded_name
        expn = @element.document.doctype.name if expn.size == 0
        @element.document.doctype.attributes_of(expn).each {
          |attribute|
          ns << attribute.name if attribute.prefix == 'xmlns'
        }
      end
      ns
    end