Bug 126839 [DataBinding] IObservable refactoring
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/provisional/databinding/IDataBindingContext.java
*/
	public IBinding bind(IUpdatable targetUpdatable, IUpdatable modelUpdatable,
			IBindSpec bindSpec) ;
	/**
	 * Convenience method to bind targetUpdatable and
	 * createUpdatable(modelDescription).
	 * 
	 * @param targetUpdatable
	 * @param modelDescription
	 * @param bindSpec
	 *            the bind spec, or null
	 * @return The IBinding that manages this data flow
	 */
	public IBinding bind(IUpdatable targetUpdatable, Object modelDescription,
			IBindSpec bindSpec);
	/**
	 * Convenience method to bind createUpdatable(targetDescription) and
	 * modelUpdatable.
	 * 
	 * @param targetDescription
	 * @param modelUpdatable
	 * @param bindSpec
	 *            the bind spec, or null
	 * @return The IBinding that manages this data flow
	 */
	public IBinding bind(Object targetDescription, IUpdatable modelUpdatable,
			IBindSpec bindSpec) ;
	/**
	 * Convenience method to bind createUpdatable(targetDescription) and
	 * createUpdatable(modelDescription).