Present and update values of java bean properties. A Converter supports two different `convert()` methods:

- fill the values of html form elements from bean properties for presentation
- update the bean properties from user input, i.e. http request parameters

#### Formatting values for display

Values from bean properties are formatted, using the users preferred locale. The formatted values are stored in a DOM tree for display to the user.

The DOM tree must conform to the xoplon DTD.

#### Parsing user input

HTTP paramters (i.e. user input) is parsed and the values are stored into bean properties.