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/**
@page conc_generation Data Generation
Production nodes that also produce data are called generators. To ease
configuration of such generators, they are designed so that they do not
actually produce any data until specifically asked to do so. This allows
the application to configure any property it needs before actually
starting to generate data. Starting generation is done using @ref
xnStartGenerating() or @ref xn::Generator::StartGenerating(). The
application may sometimes want to stop the generation without actually
destroying the node (for example, if it does not need this data in
current state, but does not want to loose configuration changes, or
wants to have the option to quickly resume generating data (instead of
having to initialize it again). To do so, the application may call @ref
xnStopGenerating() or @ref xn::Generator::StopGenerating.
In addition, for easier access, OpenNI supplies two functions that
control <i>all</i> generators in the context: @ref
xn::Context::StartGeneratingAll() and @ref
xn::Context::StopGeneratingAll().
*/
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