[Development] Should QFactoryInterface be documented?

[alex.blasche at nokia.com]

Is QFactoryInterface supposed to be public? It is exported and used by the internal QFactoryLoader. However it is not documented. 

Ideally I would like to reuse QFactoryLoader for the internal plugin loading but it requires the plugin to inherit from QFactoryInterface. This in turn means that it should be accessible via the docs, right? My plug-in use case requires extension by third parties.

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Alex