Bug 214649 [Markers] Allow markerAttributeGroupings and markerGroups to be specified within contentGenerators
With everything at the top level it is hard to see the relation to a contentGenerator and the groups and attribute groupings. These should be sub elements a la menus.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/CachedMarkerBuilder.java
*            id of the view we are building for
	 */
	CachedMarkerBuilder(MarkerContentGenerator contentGenerator, String id,
			IMemento memento) {
		this.generator = contentGenerator;
		this.viewId = id;
		initialiseVisibleFields();
		this.memento = memento;
		if (memento == null)
			setDefaultCategoryGroup(contentGenerator);
		else {
			
			String categoryGroupID = memento.getString(TAG_CATEGORY_GROUP);
			if (categoryGroupID == null)
				setDefaultCategoryGroup(contentGenerator);
			else {
				if (categoryGroupID.equals(VALUE_NONE))
					this.categoryGroup = null;
				else {
					MarkerGroup newGroup = MarkerSupportRegistry.getInstance()
							.getMarkerGroup(categoryGroupID);
					if (newGroup == null)
						setDefaultCategoryGroup(contentGenerator);
					else
						this.categoryGroup = newGroup;
				}
			}
		}
		createMarkerProcessJob();