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/MarkerContentGenerator.java
*/
	Collection getMarkerGroups() {
		Collection groups = new HashSet();
		
		addDefinedGroups(groups);
		
		Iterator referencingGroups = MarkerSupportRegistry.getInstance()
				.getMarkerGroups().iterator();
		while (referencingGroups.hasNext()) {
			MarkerGroup next = (MarkerGroup) referencingGroups.next();
			if (next.isGroupingFor(this.getId()))
				groups.add(next);
		}
		return groups;
	}
	/**
	 * Return the markerTypes for the receiver.
	 * 
	 * @return Collection of {@link MarkerType}
	 */
	public Collection getMarkerTypes() {
		if (markerTypes == null) {
			markerTypes = new HashSet();
			IConfigurationElement[] markerTypeElements = configurationElement
					.getChildren(MarkerSupportRegistry.MARKER_TYPE_REFERENCE);
			for (int i = 0; i < markerTypeElements.length; i++) {
				IConfigurationElement configurationElement = markerTypeElements[i];
				String elementName = configurationElement
						.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID);
				MarkerType[] types = MarkerTypesModel.getInstance().getType(