src-redefine.5.b.d: 'aa....aa' does not have a 'base' attribute that refers to the redefined element, 'bb....bb'. <complexType> children of <redefine> elements must have <extension> or <restriction> descendants, with 'base' attributes that refer to themselves.

aa....aa does not have a base attribute that references the redefined element bb....bb. The complexType children of the redefine element must have extension or restriction descendants with base attributes that reference themselves.