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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Glossary: GUPnP Reference Manual</title>
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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>
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