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Another good example for illustrating the Transformer behavior is the MultiValueField. The the related field Property can no more be a simple Property but rather a complex property containing several values.  This property is a PropertysetItemt (a Property containing several Property).

The way values of the ListProperty are set and retrieve from the related Item is also something we would like to configure. For example I may want to have a MultiField composed of DateField stored in a single multi value.
The same field may be used in another place but the values have to be stored as sub item (nodes) elements.
PropertyHandler is the second information needed. PropertyHandler handle the way property element are retrieve and set to an Item.previous mockup display a Date multi value field (3). This field is associated to a PropertysetItemt that contains the individual Date Property. This property delegate the read and write to a Transformer (1) This Transformer knows how to read and write the individual  Date Property from and to the related form item. In this example the Transformer is bound to an Item property of type list. This introduce another big advantage introduce by the Transformer's. For the same field it is possible to define several read/write strategy:
Store the field values into a single array, or into sub items, ...

REVIEW THE SECTION DOWN HERE

Configuration

These configurations are done in the common fields Properties.

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