Bug 221521 [Markers] New markers API needs to be pared down
We have too much API in some of the new classes and they can be moved to internals
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerContentGenerator.java
return filterGroups;
	}
	/**
	 * Return the id of the receiver.
	 * 
	 * @return String
	 */
	public String getId() {
		return configurationElement
				.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID);
	}
	/**
	 * Get the list of initially visible fields
	 * 
	 * @return {@link MarkerField}[]
	 */
	MarkerField[] getInitialVisible() {
		return initialVisible;
	}
	/**
	 * Get the group called groupName from the receiver
	 * 
	 * @param groupName
	 * @return MarkerGroup or <code>null</code>
	 */
	MarkerGroup getMarkerGroup(String groupName) {
		Iterator groups = getMarkerGroups().iterator();
		while (groups.hasNext()) {
			MarkerGroup group = (MarkerGroup) groups.next();
			if (group.getId().equals(groupName))