get spec() {
    if (this._uri)
      return this._uri.spec;
    return null;
  }
// Get the string representation of the URI.
Get the string representation of the URI.
Get the string representation of the URI .
get spec() {
    if (this._uri)
      return this._uri.spec;
    return null;
  }
get spec ( ) { if ( this . _uri ) return this . _uri . spec ; return null ; }
Get the string representation of the URI.
Get the string representation of the URI .