# File proofsheet.rb, line 39
  def load_document_proofsheets(xml_url)
      xml_document = REXML::Document.new(fetch_xml(xml_url))
      xml_document.schema_instructions.each do |si|
        uri = si.attributes['uri'].downcase
        url = si.attributes['url']
        # be sure we only get relavent schema types
        if uri.downcase == "http://www.transami.net/namespace/xmlproof"
          if is_relative?(url)
            relative_to_xml_url = File.dirname(xml_url) + '/' + url
          else
            relative_to_xml_url = url
          end
          self << Proofsheet.new(relative_to_xml_url)
        end
      end
      return xml_document
    end