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
*/
	MarkerMap generateFilteredMarkers(SubProgressMonitor subMonitor,
			boolean andFilters, IResource[] focusResources,
			Collection enabledFilters) {
		Collection returnMarkers = null;
		if (enabledFilters.size() > 0) {
			Iterator filtersIterator = enabledFilters.iterator();
			if (andFilters) {
				Collection matching = new HashSet();
				while (filtersIterator.hasNext()) {
					computeMarkers(matching, subMonitor,
							(MarkerFieldFilterGroup) filtersIterator.next(),
							focusResources);
					if (returnMarkers == null)
						returnMarkers = new HashSet(matching);
					else
						findIntersection(matching, returnMarkers);
					matching.clear();
				}
			} else {
				returnMarkers = new HashSet();
				while (filtersIterator.hasNext()) {
					computeMarkers(returnMarkers, subMonitor,
							(MarkerFieldFilterGroup) filtersIterator.next(),
							focusResources);
				}
			}
		} else
			returnMarkers = computeAllMarkers(subMonitor);
		MarkerEntry[] entries = new MarkerEntry[returnMarkers.size()];