Bug 126839 [DataBinding] IObservable refactoring
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/beans/PropertyHelper.java
/**
	 * nested property seperator
	 * TODO discuss nesting with .
	 */
	public final static String PROPERTY_NESTING_SEPERATOR = ".";  
	
	private final String   propertyString;
	private final Class    rootClass;
	private final String[] propertyList;