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<div class="glossary">
<div class="titlepage"><div><div><h1 class="title">
<a name="glossary"></a>Glossary</h1></div></div></div>
<dl>
<dt>
<a name="action"></a><span class="glossterm">Action</span>
</dt>
<dd class="glossdef">
<p>
An <em class="firstterm">Action</em> is a method call on a
<em class="glossterm">Service</em>, which encapsulated a single piece of
functionality. Actions can have multiple input and output arguments, and
can return error codes. UPnP allows one of the output arguments to be
marked as the <em class="firstterm">return value</em>, but GUPnP doesn't treat
return values specially.
</p>
<p>
Every action argument has a related <em class="glossterm">State Variable</em>,
which determines the type of the argument. Note that even if the argument
wouldn't need a state variable it is still required, due to historical
reasons.
</p>
</dd>
<dt>
<a name="controlpoint"></a><span class="glossterm">Control Point</span>
</dt>
<dd class="glossdef"><p>
A <em class="firstterm">Control Point</em> is an entity on the network which
communicates with other <em class="glossterm">Devices</em> and
<em class="glossterm">Services</em>. In the client/server model the control
point is a client and the <em class="glossterm">Service</em> is a server,
although it is common for devices to also be a control point because
whilst a single control point/service connection is client/server, the
UPnP network as whole is peer-to-peer.
</p></dd>
<dt>
<a name="device"></a><span class="glossterm">Device</span>
</dt>
<dd class="glossdef">
<p>
A <em class="firstterm">Device</em> is an entity on the network which
communicates using the UPnP standards. This can be a dedicated physical
device such as a router or printer, or a PC which is running software
implementing the UPnP standards.
</p>
<p>
A Device can contain sub-devices, for example a combination
printer/scanner could appear as a general device with a printer
sub-device and a scanner sub-device.
</p>
<p>
Every device has zero or more <em class="glossterm">Services</em>. UPnP defines many standard
device types, which specify services which are required to be implemented.
Alternatively, a non-standard device type could be used. Examples of
standard device types are <code class="literal">MediaRenderer</code> or
<code class="literal">InternetGatewayDevice</code>.
</p>
<p>See Also <a class="glossseealso" href="glossary.html#service">Service</a>.</p>
</dd>
<dt><span class="glossterm">DIDL-Lite</span></dt>
<dd><p>See <a class="glosssee" href="glossary.html#didllite">Digital Item Declaration Language - Lite</a>.</p></dd>
<dt>
<a name="didllite"></a><span class="glossterm">Digital Item Declaration Language - Lite</span>
</dt>
<dd class="glossdef"><p>
An XML schema used to represent digital content metadata. Defined by
the UPnP Forum.
</p></dd>
<dt><span class="glossterm">SCPD</span></dt>
<dd><p>See <a class="glosssee" href="glossary.html#scpd">Service Control Protocol Document</a>.</p></dd>
<dt>
<a name="service"></a><span class="glossterm">Service</span>
</dt>
<dd class="glossdef">
<p>
A <em class="firstterm">Service</em> is a collection of related methods
(called <em class="glossterm">Actions</em>) and public variables (called
<em class="glossterm">State Variables</em>) which together form a logical
interface.
</p>
<p>
UPnP defines standard services that define actions and variables which
must be present and their semantics. Examples of these are
<code class="literal">AVTransport</code> and <code class="literal">WANIPConnection</code>.
</p>
<p>See Also <a class="glossseealso" href="glossary.html#action">Action</a>, <a class="glossseealso" href="glossary.html#device">Device</a>, <a class="glossseealso" href="glossary.html#state-variable">State Variable</a>.</p>
</dd>
<dt>
<a name="scpd"></a><span class="glossterm">Service Control Protocol Document</span>
</dt>
<dd class="glossdef">
<p>
An XML document which defines the set of <em class="glossterm">Actions</em>
and <em class="glossterm">State Variables</em> that a
<em class="glossterm">Service</em> implements.
</p>
<p>See Also <a class="glossseealso" href="glossary.html#service">Service</a>, <a class="glossseealso" href="glossary.html#action">Action</a>, <a class="glossseealso" href="glossary.html#state-variable">State Variable</a>.</p>
</dd>
<dt>
<a name="ssdp"></a><span class="glossterm">Simple Service Discovery Protocol</span>
</dt>
<dd class="glossdef">
<p>
UPnP device discovery protocol. Specifies how <em class="glossterm">Devices</em>
advertise their <em class="glossterm">Services</em> in the network and also how
<em class="glossterm">Control Points</em> search for
services and devices respond.
</p>
<p>See Also <a class="glossseealso" href="glossary.html#device">Device</a>, <a class="glossseealso" href="glossary.html#controlpoint">Control Point</a>, <a class="glossseealso" href="glossary.html#service">Service</a>.</p>
</dd>
<dt><span class="glossterm">SSDP</span></dt>
<dd><p>See <a class="glosssee" href="glossary.html#ssdp">Simple Service Discovery Protocol</a>.</p></dd>
<dt>
<a name="state-variable"></a><span class="glossterm">State Variable</span>
</dt>
<dd class="glossdef"><p>
A <em class="firstterm">State Variable</em> is a public variable exposing some
aspect of the service's state. State variables are typed and optionally
are <em class="firstterm">evented</em>, which means that any changes will be
notified. Control points are said to <em class="firstterm">subscribe</em> to
a state variable to receive change notifications.
</p></dd>
<dt><span class="glossterm">UDN</span></dt>
<dd><p>See <a class="glosssee" href="glossary.html#udn">Unique Device Name</a>.</p></dd>
<dt>
<a name="udn"></a><span class="glossterm">Unique Device Name</span>
</dt>
<dd class="glossdef">
<p>
A a unique identifier which is <span class="emphasis"><em>unique</em></span> for every
device but <span class="emphasis"><em>never changes</em></span> for each particular
device.
</p>
<p>
A common practise is to generate a unique UDN on first boot from a
random seed, or use some unique and persistent property such as the
device's MAC address to create the UDN.
</p>
<p>See Also <a class="glossseealso" href="glossary.html#device">Device</a>.</p>
</dd>
</dl>
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