-In some cases keeping the model and the UI in sync is not enough. Errai's [code]+DataBinder+ allows for the registration of [code]+PropertyChangeHandlers+ for specific properties, property expressions or all properties of a bound model. A property expression can be a property chain such as customer.address.street. It can end in a wildcard to indicate that changes of any property of the corresponding bean should be observed (e.g [code]+"customer.address.\*"+ ). A double wildcard can be used at the end of a property expression to register a cascading change handler for any nested property (e.g [code]+"customer.\*\*"+).
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