Bug 325852 Add description attribute to MPartDescriptor/MPart
Adding this new attribute we could e.g. show additional informations about a Part in Show View-Dialog, ...
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/descriptor/basic/impl/PartDescriptorImpl.java
return;
			case BasicPackageImpl.PART_DESCRIPTOR__LOCAL_TOOLTIP:
				setLocalTooltip(LOCAL_TOOLTIP_EDEFAULT);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__LOCAL_IMAGE:
				setLocalImage(LOCAL_IMAGE_EDEFAULT);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__HANDLERS:
				getHandlers().clear();
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__BINDING_CONTEXTS:
				getBindingContexts().clear();
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__ALLOW_MULTIPLE:
				setAllowMultiple(ALLOW_MULTIPLE_EDEFAULT);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__CATEGORY:
				setCategory(CATEGORY_EDEFAULT);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__MENUS:
				getMenus().clear();
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__TOOLBAR:
				setToolbar((MToolBar)null);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__CLOSEABLE:
				setCloseable(CLOSEABLE_EDEFAULT);
				return;
			case BasicPackageImpl.PART_DESCRIPTOR__DIRTYABLE:
				setDirtyable(DIRTYABLE_EDEFAULT);