Bug 221337 [Markers] MarkerItem has too much API
We are exposing too much as API in MarkerItem. We should only provide getAtttributeValue and the methods that support PATH_ATTRIBUTE and NAME_ATTRIBUTE as they are tricky. Everything else needs to be pushed down to an internal class. We should mention the relevant IMarker constants for those removed.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/CachedMarkerBuilder.java
*/
	private void loadLegacyFilter(IMemento child) {
		MarkerFieldFilterGroup newGroup = new MarkerFieldFilterGroup(null, this);
		newGroup.legacyLoadSettings(child);
		getAllFilters().add(newGroup);
	}
	/**
	 * Load the pre-3.4 filters.
	 * 
	 * @param mementoString
	 */
	private void loadLegacyFiltersFrom(String mementoString) {
		if (mementoString.equals(IPreferenceStore.STRING_DEFAULT_DEFAULT))
			return;
		IMemento memento;
		try {
			memento = XMLMemento
					.createReadRoot(new StringReader(mementoString));
			restoreLegacyFilters(memento);
		} catch (WorkbenchException e) {
			StatusManager.getManager().handle(e.getStatus());
			return;
		}
	}
	/**
	 * Load the user supplied filter
	 * 
	 * @param child
	 */
	private void loadUserFilter(IMemento child) {