componentRefList modifier Attribute
The "modifier" attribute of the <componentRefList> element specifies the override requirements for the list. If specified, the value must be FINAL.
If FINAL, derived components may not declare new <componentRef> elements.
If unspecified, then derived components can add new <componentRef> elements.
In either case, derived components may override the <type> element, and non-final inherited <componentRef> elements. If the base component"s componentRefList modifier is final, then that of the derived component must also be final.
Note –
A final modifier on the <componentRefList> element does not imply that each of the contained <componentRef>s are also final.
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