4 The widgets are described by the W3C's technical recommendations
5 [Packaged Web Apps (Widgets)](http://www.w3.org/TR/widgets) and [XML Digital Signatures for Widgets](http://www.w3.org/TR/widgets-digsig)
7 In summary, **widgets are ZIP files that can be signed and
8 whose content is described by the file <config.xml>**.