/**
@page modules_node_interface Implement the Proper Interface

Note that OpenNI has a different interface for a node implementation 
(MPI) than the actual API of the node. Although they seem superficially 
very similar, the MPI and API interfaces are different. 

The module's MPI interfaces (C++ ones) are defined in file @ref 
XnModuleCppInterface.h. 

The following table lists current OpenNI node types and their module 
interface. 

<table>
	<tr>
		<th>Node Type</th>
		<th>Module Interface</th>
	</tr>
	<tr>
		<td>Production Node</td>
		<td>@ref xn::ModuleProductionNode</td>
	</tr>
	<tr>
		<td>Device</td>
		<td>@ref xn::ModuleDevice</td>
	</tr>
	<tr>
		<td>Generator</td>
		<td>@ref xn::ModuleGenerator</td>
	</tr>
	<tr>
		<td>Recorder</td>
		<td>@ref xn::ModuleRecorder</td>
	</tr>
	<tr>
		<td>Player</td>
		<td>@ref xn::ModulePlayer</td>
	</tr>
	<tr>
		<td>Map Generator</td>
		<td>@ref xn::ModuleMapGenerator</td>
	</tr>
	<tr>
		<td>Depth Generator</td>
		<td>@ref xn::ModuleDepthGenerator</td>
	</tr>
	<tr>
		<td>Image Generator</td>
		<td>@ref xn::ModuleImageGenerator</td>
	</tr>
	<tr>
		<td>IR Generator</td>
		<td>@ref xn::ModuleIRGenerator</td>
	</tr>
	<tr>
		<td>Gestures Generator</td>
		<td>@ref xn::ModuleGestureGenerator</td>
	</tr>
	<tr>
		<td>Scene Analyzer</td>
		<td>@ref xn::ModuleSceneAnalyzer</td>
	</tr>
	<tr>
		<td>Hands Generator</td>
		<td>@ref xn::ModuleHandsGenerator</td>
	</tr>
	<tr>
		<td>User Generator</td>
		<td>@ref xn::ModuleUserGenerator</td>
	</tr>
	<tr>
		<td>Audio Generator</td>
		<td>@ref xn::ModuleAudioGenerator</td>
	</tr>
	<tr>
		<td>Codec</td>
		<td>@ref xn::ModuleCodec</td>
	</tr>
	<tr>
		<td>Script</td>
		<td>@ref xn::ModuleScriptNode</td>
	</tr>
</table>

When you want to create a new class, it must inherit virtually from the 
corresponding interface. For example, if you are developing a hand 
generator, the class declaration must be as follows: 

@code
class MyHandGenerator: public virtual xn::ModuleHandsGenerator
{
...
};
@endcode

*/