EMSCRIPTEN_KEEPALIVE
char getAnnotations(fz_document doc, int page)
{
  static unsigned char *data = NULL;
  fz_stext_page *text;
  fz_buffer *buf;
  fz_output *out;
  pdf_annot *annot;

  fz_free(ctx, data);
  data = NULL;

  loadPage(doc, number);

  buf = fz_new_buffer(ctx, 0);
  {
    out = fz_new_output_with_buffer(ctx, buf);
    fz_write_printf(ctx, out, "<annotations>");
    {
      annot = pdf_first_annot(ctx, page);

      while (annot)
      {
        ....
        annot = pdf_next_annot(ctx, annot);
      }