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/views/markers/internal/MarkerGroup.java
* 
	 * @param markerType
	 * @return MarkerType[]
	 */
	private MarkerType[] getMarkerTypes(String markerType) {
		MarkerTypesModel model = MarkerTypesModel.getInstance();
		Collection types = new HashSet();
		MarkerType type = model.getType(markerType);
		if (type != null) {
			types.add(type);
			MarkerType[] subs = type.getAllSubTypes();
			for (int j = 0; j < subs.length; j++) {
				types.add(subs[j]);
			}
		}
		if (types.isEmpty()) {
			return new MarkerType[0];
		}
		MarkerType[] typesArray = new MarkerType[types.size()];
		types.toArray(typesArray);
		return typesArray;
	}
	/**
	 * Return the title for the receiver.
	 * 
	 * @return String
	 */
	public String getTitle() {
		return configurationElement.getAttribute(MarkerSupportRegistry.LABEL);
	}