Bug 127861 [DataBinding] Mark API provisional
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/IBindSupportFactory.java
/**
	 * Creates a validator for the given from and to types and model
	 * description. Either toType or modelDescription can be null, but not both.
	 * The returned validator (if not null) should validate arbitrary values of
	 * type toType, and (in the case that toType is given) ensure that they can
	 * be converted to toType, and (in the case that modelDescription is given)
	 * ensure that they can be converted to the type expected by updatable
	 * objects created from the given model description.
	 * 
	 * @param fromType
	 *            The type to validate
	 * @param toType
	 *            The type to convert to after successful validation, or
	 *            <code>null</code> if not known
	 * @param modelDescription
	 *            The model description object passed to
	 *            DataBindingContext#bind, or <code>null</code> if not known
	 * @return a validator, or <code>null</code> if this factory cannot create
	 *         a validator for the given arguments.
	 */
	IValidator createValidator(Class fromType, Class toType,
			Object modelDescription);
	
	/**
	 * Creates a domain validator for the given model description.  Either modelType