function setConfig( $config, $value ) {
    switch( strtoupper( $config )) {
      case 'ALLOWEMPTY':
        $this->allowEmpty = $value;
        break;
      case 'DELIMITER':
        $this->delimiter = $value;
        break;
      case 'DIRECTORY':
        $value   = trim( $value );
        $nl      = $this->getConfig('delimiter');
        if( $nl == substr( $value, ( 0 - strlen( $nl ))))
          $value = substr( $value, 0, ( strlen( $value ) - strlen( $nl )));
        if( is_dir( $value )) {
            /* local directory */
          clearstatcache();
          $this->directory = $value;
          $this->url       = null;
          return TRUE;
        }
        else
          return FALSE;
        break;
      case 'FILENAME':
        $value   = trim( $value );
        if( !empty( $this->url )) {
            /* remote directory+file - URL */
          $this->filename = $value;
          return TRUE;
        }
        $dirfile = $this->getConfig( 'directory' ).$this->getConfig( 'delimiter' ).$value;
        if( file_exists( $dirfile )) {
            /* local existing file */
          if( is_readable( $dirfile ) || is_writable( $dirfile )) {
            clearstatcache();
            $this->filename = $value;
            return TRUE;
          }
          else
            return FALSE;
        }
        elseif( FALSE !== touch( $dirfile )) {
            /* new local file created */
          $this->filename = $value;
          return TRUE;
        }
        else
          return FALSE;
        break;
      case 'FORMAT':
        $value   = trim( $value );
        if( 'xcal' == strtolower( $value )) {
          $this->format             = 'xcal';
          $this->attributeDelimiter = $this->nl;
          $this->valueInit          = null;
        }
        else {
          $this->format             = null;
          $this->attributeDelimiter = ';';
          $this->valueInit          = ':';
        }
        break;
      case 'LANGUAGE':
         // set language for calendar component as defined in [RFC 1766]
        $value   = trim( $value );
        $this->language = $value;
        break;
      case 'NL':
      case 'NEWLINECHAR':
        $this->nl = $value;
        break;
      case 'UNIQUE_ID':
        $value   = trim( $value );
        $this->unique_id = $value;
        break;
      case 'URL':
            /* remote file - URL */
        $value     = trim( $value );
        $value     = str_replace( 'HTTP://',   'http://', $value );
        $value     = str_replace( 'WEBCAL://', 'http://', $value );
        $value     = str_replace( 'webcal://', 'http://', $value );
        $this->url = $value;
        $this->directory = null;
        $parts     = pathinfo( $value );
        return $this->setConfig( 'filename',  $parts['basename'] );
        break;
    }
  }