Bug 213014 [Markers] New view doesn't rank fatal errors first any longer when sorting per Java type
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerGroup.java
MarkerGroupingEntry groupingEntry;
		/**
		 * Create an entry mapping for the receiver.
		 * 
		 * @param entry
		 */
		EntryMapping(MarkerGroupingEntry entry) {
			groupingEntry = entry;
		}
		/**
		 * Return whether or not the receiver tests attributes.
		 * 
		 * @return boolean
		 */
		public boolean hasAttributes() {
			return false;
		}
		/**
		 * Test the attribute of the marker to find a grouping.
		 * 
		 * @param marker
		 * @return MarkerGroupingEntry or <code>null</code> if there is not
		 *         entry.
		 */
		public MarkerGroupingEntry testAttribute(IMarker marker) {
			return null;
		}
	}
	class FieldGroup implements IField {