According to the docs in
/libs/granite/ui/components/foundation/form/multifield/render.jsp there
is the possibility to have several subcomponents within a multifield:...
* If the subcomponent is a composite, it is its responsibility to
concatenate the fields into * one, before the form gets submitted, and
to separate them again on rendering....Does someone have an example for
such a multifield with a composite children? The only references to
multifield I found in AEM6 were with only one simple ...