public interface ILabelProviderLocatorThis interface can be used to mark some complex component, e.g. a Panel, as capable of providing a reference to a
ILabelProvider, e.g a form component. The typical use case could be a user has a components factory of type "label" --> "panel with some fields". Let's say the structure of this panel varies but we still would like to use wicket:for="panel". In this case this panel could implement ILabelProviderLocator to point to TextFiled that label should refer to.