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diff --git a/src/out_internal.h b/src/out_internal.h
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+/**
+ * @file out_internal.h
+ * @author Radek Krejci <rkrejci@cesnet.cz>
+ * @brief Internal structures and functions for libyang
+ *
+ * Copyright (c) 2015-2020 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_OUT_INTERNAL_H_
+#define LY_OUT_INTERNAL_H_
+
+#include "out.h"
+
+struct lyd_node;
+
+/**
+ * @brief Printer output structure specifying where the data are printed.
+ */
+struct ly_out {
+    LY_OUT_TYPE type;     /**< type of the output to select the output method */
+
+    union {
+        int fd;          /**< file descriptor for LY_OUT_FD type */
+        FILE *f;         /**< file structure for LY_OUT_FILE, LY_OUT_FDSTREAM and LY_OUT_FILEPATH types */
+
+        struct {
+            FILE *f;          /**< file stream from the original file descriptor, variable is mapped to the LY_OUT_FILE's f */
+            int fd;           /**< original file descriptor, which was not used directly because of missing vdprintf() */
+        } fdstream;      /**< structure for LY_OUT_FDSTREAM type, which is LY_OUT_FD when vdprintf() is missing */
+        struct {
+            FILE *f;          /**< file structure for LY_OUT_FILEPATH, variable is mapped to the LY_OUT_FILE's f */
+            char *filepath;   /**< stored original filepath */
+        } fpath;         /**< filepath structure for LY_OUT_FILEPATH */
+        struct {
+            char **buf;       /**< storage for the pointer to the memory buffer to store the output */
+            size_t len;       /**< number of used bytes in the buffer */
+            size_t size;      /**< allocated size of the buffer */
+        } mem;           /**< memory buffer information for LY_OUT_MEMORY type */
+        struct {
+            ssize_t (*func)(void *arg, const void *buf, size_t count); /**< callback function */
+            void *arg;        /**< optional argument for the callback function */
+        } clb;           /**< printer callback for LY_OUT_CALLBACK type */
+    } method;            /**< type-specific information about the output */
+
+    /* LYB only */
+    char *buffered;      /**< additional buffer for holes */
+    size_t buf_len;      /**< number of used bytes in the additional buffer for holes */
+    size_t buf_size;     /**< allocated size of the buffer for holes */
+    size_t hole_count;   /**< hole counter */
+
+    size_t printed;      /**< Total number of printed bytes */
+    size_t func_printed; /**< Number of bytes printed by the last function */
+};
+
+/**
+ * @brief Generic printer of the given format string into the specified output.
+ *
+ * Does not reset printed bytes. Adds to printed bytes.
+ *
+ * @param[in] out Output specification.
+ * @param[in] format Format string to be printed.
+ * @return LY_ERR value.
+ */
+LY_ERR ly_print_(struct ly_out *out, const char *format, ...);
+
+/**
+ * @brief Generic printer of the given string buffer into the specified output.
+ *
+ * Does not reset printed bytes. Adds to printed bytes.
+ *
+ * @param[in] out Output specification.
+ * @param[in] buf Memory buffer with the data to print.
+ * @param[in] len Length of the data to print in the @p buf.
+ * @return LY_ERR value.
+ */
+LY_ERR ly_write_(struct ly_out *out, const char *buf, size_t len);
+
+/**
+ * @brief Create a hole in the output data that will be filled later.
+ *
+ * Adds printed bytes.
+ *
+ * @param[in] out Output specification.
+ * @param[in] len Length of the created hole.
+ * @param[out] position Position of the hole, value must be later provided to the ::ly_write_skipped() call.
+ * @return LY_ERR value.
+ */
+LY_ERR ly_write_skip(struct ly_out *out, size_t len, size_t *position);
+
+/**
+ * @brief Write data into the hole at given position.
+ *
+ * Does not change printed bytes.
+ *
+ * @param[in] out Output specification.
+ * @param[in] position Position of the hole to fill, the value was provided by ::ly_write_skip().
+ * @param[in] buf Memory buffer with the data to print.
+ * @param[in] len Length of the data to print in the @p buf. Not that the length must correspond
+ * to the len value specified in the corresponding ::ly_write_skip() call.
+ * @return LY_ERR value.
+ */
+LY_ERR ly_write_skipped(struct ly_out *out, size_t position, const char *buf, size_t len);
+
+#endif /* LY_OUT_INTERNAL_H_ */