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Now for a MultiField, the related Property can no more be a simple Property but rather a ListProperty . This ListProperty will be populated with the individual field Property values.
This is the first information needed in order to handle complex fields: The PropertType (Basic, List, Composite,...)

The way values of the ListProperty is 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.
PropertHandler is the second information needed. PropertHandler handle the way property element are retrieve and set to an Item.

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