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<title>The ROOM Model</title>
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<h1 xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">The ROOM Model</h1>
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<h2 class="title" style="clear: both">
<a name="TheROOMModel"></a>The ROOM Model</h2>
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<p>The ROOM model defines classes for Data, Protocols, Actors, SubSystems and LogicalSystems.
Thereby the three latter form a hierarchy. The
<code class="code">LogicalSystem</code> is the top level element of the structure. It contains references to
<code class="code">SubSystemClass</code> elements. The
<code class="code">SubSystemClass</code> in turn contain references to
<code class="code">ActorClass</code> elements which again contain (recursively) references to
<code class="code">ActorClass</code> elements. The complete structural hierarchy implies a tree which has the
<code class="code">LogicalSystem</code> as root and where each reference stands for a new node with possibly further branches.
</p>
<p>Let’s consider a simple example. It doesn’t implement any meaningful and completely omits behavioral and other aspects.</p>
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<div class="mediaobject">
<img src="images/080-room.jpg"></div>
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<p>When a
<code class="code">LogicalSstem</code> is instantiated then recursively all of the contained referenced elements are instantiated as instances of the corresponding class. Thus the instance tree of above example looks like this (the third line in the white boxes shows some mapping information, s.b.):
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<img src="images/080-instances.jpg"></div>
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