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> ## Registering a Custom Converter

> As is the case with a custom validator, if the application developer creates a custom converter, you must register it with the application. Here is the `converter` configuration for `CreditCardConverter` from the Duke's Bookstore application:

>     <converter>
>       <description>
>         Converter for credit card
>         numbers that normalizes
>         the input to a standard format
>       </description>
>       <converter-id>CreditCardConverter</converter-id>
>       <converter-class>
>         com.sun.bookstore6.converters.CreditCardConverter
>       </converter-class>
>     </converter>

> The `converter` element represents a `Converter` implementation and contains required `converter-id` and `converter-class` elements.

> The `converter-id` element identifies an ID that is used by the `converter` attribute of a UI component tag to apply the converter to the component's data. Using a Custom Converter (page 374) includes an example of referencing the custom converter from a component tag.

> The `converter-class` element identifies the `Converter` implementation.

> Creating a Custom Converter (page 396) explains how to create a custom converter.