diff --git a/skeletons/asn_SET_OF.c b/skeletons/asn_SET_OF.c
new file mode 100644
index 0000000..dfa9906
--- /dev/null
+++ b/skeletons/asn_SET_OF.c
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
+ * Redistribution and modifications are permitted subject to BSD license.
+ */
+#include <asn_types.h>	/* for MALLOC/REALLOC/FREEMEM */
+#include <asn_SET_OF.h>
+#include <errno.h>
+
+typedef A_SET_OF(void) asn_set;
+
+/*
+ * Add another element into the set.
+ */
+int
+asn_set_add(void *asn_set_of_x, void *ptr) {
+	asn_set *as = asn_set_of_x;
+
+	if(as == 0 || ptr == 0) {
+		errno = EINVAL;		/* Invalid arguments */
+		return -1;
+	}
+
+	/*
+	 * Make sure there's enough space to insert an element.
+	 */
+	if(as->count == as->size) {
+		int _newsize = as->size ? (as->size << 1) : 4;
+		void *_new_arr;
+		_new_arr = REALLOC(as->array, _newsize * sizeof(as->array[0]));
+		if(_new_arr) {
+			as->array = _new_arr;
+			as->size = _newsize;
+		} else {
+			/* ENOMEM */
+			return -1;
+		}
+	}
+
+	as->array[as->count++] = ptr;
+
+	return 0;
+}
+
+void
+asn_set_del(void *asn_set_of_x, int number, int _do_free) {
+	asn_set *as = asn_set_of_x;
+
+	if(as) {
+		void *ptr;
+		if(number < 0 || number >= as->count)
+			return;
+
+		if(_do_free && as->free) {
+			ptr = as->array[number];
+		} else {
+			ptr = 0;
+		}
+
+		as->array[number] = as->array[--as->count];
+
+		/*
+		 * Invoke the third-party function only when the state
+		 * of the parent structure is consistent.
+		 */
+		if(ptr) as->free(ptr);
+	}
+}
+
+/*
+ * Free the contents of the set, do not free the set itself.
+ */
+void
+asn_set_empty(void *asn_set_of_x) {
+	asn_set *as = asn_set_of_x;
+
+	if(as) {
+		if(as->array) {
+			if(as->free) {
+				while(as->count--)
+					as->free(as->array[as->count]);
+			}
+			free(as->array);
+		}
+		as->count = 0;
+		as->size = 0;
+	}
+
+}
+