xml UPDATE backup/restore input line
diff --git a/src/xml.h b/src/xml.h
index 125271f..8c8c516 100644
--- a/src/xml.h
+++ b/src/xml.h
@@ -1,9 +1,10 @@
 /**
  * @file xml.h
  * @author Radek Krejci <rkrejci@cesnet.cz>
+ * @author Michal Vasko <mvasko@cesnet.cz>
  * @brief Generic XML parser routines.
  *
- * Copyright (c) 2015 - 2018 CESNET, z.s.p.o.
+ * Copyright (c) 2015 - 2022 CESNET, z.s.p.o.
  *
  * This source code is licensed under BSD 3-Clause License (the "License").
  * You may not use this file except in compliance with the License.
@@ -100,6 +101,10 @@
 
     struct ly_set elements; /* list of not-yet-closed elements */
     struct ly_set ns;       /* handled with LY_SET_OPT_USEASLIST */
+
+    /* backup in members */
+    const char *b_current;
+    uint64_t b_line;
 };
 
 /**