A universal plug and play (UPnP) device makes itself known through a set of processes-discovery,
description, control, eventing, and presentation. Following discovery of a UPnP
device, an entity can learn more about the device and its capabilities by retrieving
the device's description. The description includes vendor-specific manufacturer
information like the model name and number, serial number, manufacturer name, URLs
to vendor-specific Web sites, etc. The description also includes a list of any
embedded devices or services, as well as URLs for control, eventing, and presentation.
The description is written by a vendor, and is usually based on a device template
produced by a UPnP forum working committee. The template is derived from a template
language that is used to define elements to describe the device and any services
supported by the device. The template language is written using an XML-based syntax
that organizes and structures the elements.
