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diff --git a/libasn1common/asn1_ref.h b/libasn1common/asn1_ref.h
new file mode 100644
index 0000000..dbc8f87
--- /dev/null
+++ b/libasn1common/asn1_ref.h
@@ -0,0 +1,80 @@
+/*
+ * Generic reference to the yet unknown type defined elsewhere.
+ */
+#ifndef	ASN1_REFERENCE_H
+#define	ASN1_REFERENCE_H
+
+struct asn1p_module_s;
+
+typedef struct asn1p_ref_s {
+
+	/*
+	 * A set of reference name components.
+	 * A reference name consists of several components separated by dots:
+	 * "OBJECT-CLASS.&Algorithm.&id"
+	 */
+	struct asn1p_ref_component_s {
+		enum asn1p_ref_lex_type_e {
+			RLT_UNKNOWN,		/* Invalid? */
+			/*
+			 * Object class reference "OCLASS1",
+			 * type reference "Type1",
+			 * value reference "id",
+			 * type field reference "&Type1",
+			 * value field reference "&id",
+			 * "OBJECT-CLASS"
+			 */
+			RLT_CAPITALS,
+			RLT_Uppercase,
+			RLT_lowercase,
+			RLT_AmpUppercase,
+			RLT_Amplowercase,
+			RLT_Atlowercase,
+			RLT_AtDotlowercase,
+			RLT_MAX
+		} lex_type;	/* Inferred lexical type of the identifier */
+		char *name;	/* An identifier */
+	} *components;
+
+	size_t comp_count;	/* Number of the components in the reference name. */
+	size_t comp_size;	/* Number of allocated structures */
+
+	struct asn1p_module_s *module;	/* Defined in module */
+	int _lineno;	/* Number of line in the file */
+} asn1p_ref_t;
+
+/*
+ * Constructor and destructor.
+ */
+asn1p_ref_t *asn1p_ref_new(int _lineno, struct asn1p_module_s *mod);
+void asn1p_ref_free(asn1p_ref_t *);
+
+asn1p_ref_t *asn1p_ref_clone(asn1p_ref_t *ref);
+
+void asn1p_ref_set_source(asn1p_ref_t *, struct asn1p_module_s *module,
+                          int lineno);
+
+
+/*
+ * Lexicographically compare references.
+ */
+int asn1p_ref_compare(const asn1p_ref_t *, const asn1p_ref_t *);
+
+/*
+ * Return a pointer to a statically allocated buffer representing the
+ * complete reference.
+ */
+const char *asn1p_ref_string(const asn1p_ref_t *);
+
+/*
+ * Add a new reference component to the existing reference structure.
+ *
+ * RETURN VALUES:
+ *  0:		All clear.
+ * -1/EINVAL:	Invalid arguments
+ * -1/ENOMEM:	Memory allocation failed
+ */
+int asn1p_ref_add_component(asn1p_ref_t *,
+	const char *name, enum asn1p_ref_lex_type_e);
+
+#endif	/* ASN1_REFERENCE_H */