@Override public Nindo apply(Pair<String, Nindo> in) {
String documentId = in.getFirst();
Nindo.Builder out = new Nindo.Builder();
in.getSecond().apply(
// StripWColonFilter must be before AttachmentIdConverter.
new StripWColonFilter(
new FixLinkAnnotationsFilter(
new PrivateReplyAnchorLegacyIdConverter(documentId,
new AttachmentIdConverter(attachmentIdMapping,
out)))));
return out.build();