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
}
	/**
	 * Add the groups defined in the receiver to the collection of groups.
	 * 
	 * @param groups
	 */
	private void addDefinedGroups(Collection groups) {
		IConfigurationElement[] children = configurationElement
				.getChildren(MarkerSupportRegistry.MARKER_SUPPORT_REFERENCE);
		for (int i = 0; i < children.length; i++) {
			
			if (!children[i]
					.getAttribute(MarkerSupportConstants.ATTRIBUTE_TYPE)
					.equals(MarkerSupportRegistry.MARKER_GROUPING))
				continue;
			MarkerGroup group = MarkerSupportRegistry
					.getInstance()
					.getMarkerGroup(
							children[i]
									.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID));
			
			if (group == null) {
				StatusManager
						.getManager()
						.handle(
								new Status(
										IStatus.ERROR,
										configurationElement
												.getDeclaringExtension()
												.getNamespaceIdentifier(),