better parsing information object class sets
diff --git a/libasn1parser/asn1p_ref.h b/libasn1parser/asn1p_ref.h
index c4d8b5c..776289b 100644
--- a/libasn1parser/asn1p_ref.h
+++ b/libasn1parser/asn1p_ref.h
@@ -49,6 +49,20 @@
asn1p_ref_t *asn1p_ref_clone(asn1p_ref_t *ref);
+void asn1p_ref_set_source(asn1p_ref_t *, asn1p_module_t *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.
*