mapfile.c:    fm_ptr->subset_tag      = 0;
mapfile.c:    if (e->subset_tag != 0)
mapfile.c:        fm_ptr->subset_tag = xstrdup(e->subset_tag);
mapfile.c:        fm_ptr->subset_tag = 0;
mapfile.c:        xfree(fm->subset_tag);
ptexlib.h:    char *subset_tag;       /* pseudoUniqueTag for subsetted font */
writefont.c:static char *make_subset_tag(void)
writefont.c:    if (fm_cur->subset_tag != 0)
writefont.c:        pdf_printf("%s+", fm_cur->subset_tag);
writefont.c:    if (is_subsetted(fm_cur) && fm_cur->subset_tag == 0)
writefont.c:        fm_cur->subset_tag = make_subset_tag();
writet1.c:            sprintf(r, "%s+%s%s", fm_cur->subset_tag, key->value.string, t1_buf);
