How can I distinguish a plugin from a fragment?

I need to find the nature of the projects in my workspace. I found the IProject.getDescription().getNatureIds() method. as I see, both a plug-in and a fragment have the same natures. So this is not the 开发者_开发问答right way to go.

Any other ideas ? Thank you

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I found the following:

IPluginModelBase[] workspaceModels = PDECore.getDefault().getModelManager().getWorkspaceModels(); and there is a isFragmentModel() method in IPluginModelBase