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+/**
+ * @file diff.h
+ * @author Michal Vasko <mvasko@cesnet.cz>
+ * @brief internal diff header
+ *
+ * Copyright (c) 2020 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.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#ifndef LY_DIFF_H_
+#define LY_DIFF_H_
+
+#include <stdint.h>
+
+#include "log.h"
+
+struct lyd_node;
+
+/**
+ * @brief Internal structure for storing current (virtual) user-ordered instances order.
+ */
+struct lyd_diff_userord {
+ const struct lysc_node *schema; /**< User-ordered list/leaf-list schema node. */
+ uint64_t pos; /**< Current position in the second tree. */
+ const struct lyd_node **inst; /**< Sized array of current instance order. */
+};
+
+/**
+ * @brief Diff operations.
+ */
+enum lyd_diff_op {
+ LYD_DIFF_OP_CREATE, /**< Subtree created. */
+ LYD_DIFF_OP_DELETE, /**< Subtree deleted. */
+ LYD_DIFF_OP_REPLACE, /**< Node value changed or (leaf-)list instance moved. */
+ LYD_DIFF_OP_NONE /**< No change of an existing inner node or default flag change of a term node. */
+};
+
+/**
+ * @brief Add a new change into diff.
+ *
+ * @param[in] node Node (subtree) to add into diff.
+ * @param[in] op Operation to set.
+ * @param[in] orig_default Original default metadata to set.
+ * @param[in] orig_value Original value metadata to set.
+ * @param[in] key Key metadata to set.
+ * @param[in] value Value metadata to set.
+ * @param[in] position Position metadata to set.
+ * @param[in] orig_key Original key metadata to set.
+ * @param[in] orig_position Original position metadata to set.
+ * @param[in,out] diff Diff to append to.
+ * @return LY_ERR value.
+ */
+LIBYANG_API_DECL LY_ERR lyd_diff_add(const struct lyd_node *node, enum lyd_diff_op op, const char *orig_default, const char *orig_value,
+ const char *key, const char *value, const char *position, const char *orig_key, const char *orig_position,
+ struct lyd_node **diff);
+
+#endif /* LY_DIFF_H_ */