Implementation of preference pages controlling the GMF EMF UI plug-in's UI interaction with the user.

## Package Specification

Clients may contribute the {@link org.eclipse.gmf.runtime.emf.ui.preferences.PathmapsPreferencePage} for their application preferences using the `org.eclipse.ui.preferencePages` extension point. The {@link org.eclipse.gmf.runtime.emf.ui.preferences.PathmapsPreferencePage} allows the user to specify the path variables that should be considered for modeling. Path variable are created on the "Linked Resources" preference page, and selected for modeling using this page.

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