open type skeleton
diff --git a/skeletons/OPEN_TYPE.h b/skeletons/OPEN_TYPE.h
new file mode 100644
index 0000000..cddb401
--- /dev/null
+++ b/skeletons/OPEN_TYPE.h
@@ -0,0 +1,47 @@
+/*-
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#ifndef ASN_OPEN_TYPE_H
+#define ASN_OPEN_TYPE_H
+
+#include <asn_application.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define OPEN_TYPE_free CHOICE_free
+#define OPEN_TYPE_print CHOICE_print
+#define OPEN_TYPE_compare CHOICE_compare
+#define OPEN_TYPE_constraint CHOICE_constraint
+#define OPEN_TYPE_decode_ber NULL
+#define OPEN_TYPE_encode_der CHOICE_encode_der
+#define OPEN_TYPE_decode_xer NULL
+#define OPEN_TYPE_encode_xer CHOICE_encode_xer
+#define OPEN_TYPE_decode_uper NULL
+#define OPEN_TYPE_encode_uper CHOICE_encode_uper
+
+
+/*
+ * Decode an Open Type which is potentially constraiend
+ * by the other members of the parent structure.
+ */
+asn_dec_rval_t OPEN_TYPE_uper_get(asn_codec_ctx_t *opt_codec_ctx,
+ asn_TYPE_descriptor_t *parent_type,
+ void *parent_structure,
+ asn_TYPE_member_t *element,
+ asn_per_data_t *pd);
+
+asn_dec_rval_t OPEN_TYPE_oer_get(asn_codec_ctx_t *opt_codec_ctx,
+ asn_TYPE_descriptor_t *parent_type,
+ void *parent_structure,
+ asn_TYPE_member_t *element,
+ const void *ptr, size_t size);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ASN_OPEN_TYPE_H */