code: public void buildDefaultValueInfo(XMLNode node, Content annotationDocTree) {
          ((AnnotationTypeOptionalMemberWriter) writer).addDefaultValueInfo(
                  (MemberDoc) members.get(currentMemberIndex),
                  annotationDocTree);
      }
docs: Build the default value for this optional member.
  
  @param node the XML element that specifies which components to document
  @param annotationDocTree the content tree to which the documentation will be added