CHOICE XER support, draft

diff --git a/skeletons/constr_CHOICE.h b/skeletons/constr_CHOICE.h
index 2685134..ea32467 100644
--- a/skeletons/constr_CHOICE.h
+++ b/skeletons/constr_CHOICE.h
@@ -36,6 +36,7 @@
 asn_constr_check_f CHOICE_constraint;
 ber_type_decoder_f CHOICE_decode_ber;
 der_type_encoder_f CHOICE_encode_der;
+xer_type_decoder_f CHOICE_decode_xer;
 xer_type_encoder_f CHOICE_encode_xer;
 asn_outmost_tag_f CHOICE_outmost_tag;