Bug 126839 [DataBinding] IObservable refactoring
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/provisional/databinding/BindSpec.java
private IConverter converter;
	private IValidator validator;
	private final Integer modelUpdatePolicy;
	private final Integer validatePolicy;
	private final Integer targetUpdatePolicy;
	private IDomainValidator domainValidator;
	/**
	 * Creates a bind spec with the given converter, validator, and update
	 * policies.
	 * 
	 * @param converter
	 * @param validator
	 * @param domainValidator 
	 * @param modelUpdatePolicy
	 * @param validatePolicy
	 * @param targetUpdatePolicy
	 */