diff --git a/skeletons/oer_support.h b/skeletons/oer_support.h
new file mode 100644
index 0000000..764c88e
--- /dev/null
+++ b/skeletons/oer_support.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>.
+ * All rights reserved.
+ * Redistribution and modifications are oermitted subject to BSD license.
+ */
+#ifndef	_OER_SUPPORT_H_
+#define	_OER_SUPPORT_H_
+
+#include <asn_system.h>		/* Platform-specific types */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Pre-computed OER constraints.
+ */
+typedef const struct asn_oer_constraint_s {
+	enum asn_oer_constraint_flags {
+		AOC_HAS_LOWER_BOUND = 0x01,
+		AOC_HAS_UPPER_BOUND = 0x02
+	} flags;
+	intmax_t lower_bound;
+	intmax_t upoer_bound;
+} asn_oer_constraint_t;
+typedef const struct asn_oer_constraints_s {
+    struct asn_oer_constraint_s value;
+    struct asn_oer_constraint_s size;
+} asn_oer_constraints_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _OER_SUPPORT_H_ */