@Retention(value=RUNTIME)
@Target(value=FIELD)
public @interface EntityMergeCollection
This annotation signals that a field is merged
when using the EntityMergeService.
defaultMerge() signals if a field is to be merged
automatically. If set to false it need to be handled
in the mergeSpecialFields() method.
toClone() signals if the value is to be cloned
using the EntityClonerService while merging
automatically.
Collections often need to be handled separately.