Bug 118429 [DataBinding] Validation should use IStatus, not just Strings
In order to use data binding in Workbench or IDE dialogs and preference pages, we need validation in terms of IStatus objects. Using strings is too simplistic. For example, look at the wizard for creating a new class. You will get a warning if the class name does not start with an uppercase letter, or if you don't provide a package name, but you will still be able to click "Finish" to proceed anyway. (Note that IStatus is currently not on the classpath, we need to re-introduce the dependency on org.eclipse.equinox.common, which contains IStatus etc.)
bundles/org.eclipse.core.databinding/src/org/eclipse/core/databinding/DataBindingContext.java
* creation time
	 * 
	 * @return the observable list containing all bindings
	 */
	public IObservableList getBindings() {
		return unmodifiableBindings;
	}
	/**
	 * Returns an observable value of type ValidationError, containing the most
	 * recent partial validation error
	 * 
	 * @return the validation error observable
	 */
	public IObservableValue getPartialValidationError() {
		return partialValidationError;
	}
	/**
	 * Returns an observable value of type ValidationError, containing the most
	 * recent full validation error, i.e. the last element of the list returned
	 * by getValidationErrors().
	 * 
	 * @return the validation observable
	 */
	public IObservableValue getValidationError() {
		return validationError;
	}
	/**
	 * Returns an observable list with elements of type ValidationError, ordered
	 * by the time of detection
	 *