code: public static XSLUpdate readFile(final InstallFile _installFile)
      {
          final XSLUpdate ret = new XSLUpdate(_installFile);
          final XSLDefinition definition = ret.new XSLDefinition(_installFile);
          ret.addDefinition(definition);
          return ret;
      }
docs: Read the file.
  
  @param _installFile the install file
  @return XSLUpdate