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diff --git a/subversion/libsvn_fs_x/noderevs.h b/subversion/libsvn_fs_x/noderevs.h
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+/* noderevs.h --- FSX node revision container
+ *
+ * ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one
+ *    or more contributor license agreements.  See the NOTICE file
+ *    distributed with this work for additional information
+ *    regarding copyright ownership.  The ASF licenses this file
+ *    to you under the Apache License, Version 2.0 (the
+ *    "License"); you may not use this file except in compliance
+ *    with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing,
+ *    software distributed under the License is distributed on an
+ *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *    KIND, either express or implied.  See the License for the
+ *    specific language governing permissions and limitations
+ *    under the License.
+ * ====================================================================
+ */
+
+#ifndef SVN_LIBSVN_FS__NODEREVS_H
+#define SVN_LIBSVN_FS__NODEREVS_H
+
+#include "svn_io.h"
+#include "fs.h"
+
+/* A collection of related noderevs tends to be widely redundant (similar
+ * paths, predecessor ID matching anothers ID, shared representations etc.)
+ * Also, the binary representation of a noderev can be much shorter than
+ * the ordinary textual variant.
+ *
+ * In its serialized form, the svn_fs_x__noderevs_t container extracts
+ * most of that redundancy and the run-time representation is also much
+ * smaller than sum of the respective svn_fs_x__noderev_t objects.
+ *
+ * As with other containers, this one has two modes: 'construction', in
+ * which you may add data to it, and 'getter' in which there is only r/o
+ * access to the data.
+ */
+
+/* An opaque collection of node revisions.
+ */
+typedef struct svn_fs_x__noderevs_t svn_fs_x__noderevs_t;
+
+/* Create and populate noderev containers. */
+
+/* Create and return a new noderevs container with an initial capacity of
+ * INITIAL_COUNT svn_fs_x__noderev_t objects.
+ * Allocate the result in RESULT_POOL.
+ */
+svn_fs_x__noderevs_t *
+svn_fs_x__noderevs_create(int initial_count,
+                          apr_pool_t *result_pool);
+
+/* Add NODEREV to the CONTAINER. Return the index that identifies the new
+ * item in this container.
+ */
+apr_size_t
+svn_fs_x__noderevs_add(svn_fs_x__noderevs_t *container,
+                       svn_fs_x__noderev_t *noderev);
+
+/* Return a rough estimate in bytes for the serialized representation
+ * of CONTAINER.
+ */
+apr_size_t
+svn_fs_x__noderevs_estimate_size(const svn_fs_x__noderevs_t *container);
+
+/* Read from noderev containers. */
+
+/* From CONTAINER, extract the noderev with the given IDX.  Allocate
+ * the result in POOL and return it in *NODEREV_P.
+ */
+svn_error_t *
+svn_fs_x__noderevs_get(svn_fs_x__noderev_t **noderev_p,
+                       const svn_fs_x__noderevs_t *container,
+                       apr_size_t idx,
+                       apr_pool_t *pool);
+
+/* I/O interface. */
+
+/* Write a serialized representation of CONTAINER to STREAM.
+ * Use SCRATCH_POOL for temporary allocations.
+ */
+svn_error_t *
+svn_fs_x__write_noderevs_container(svn_stream_t *stream,
+                                   const svn_fs_x__noderevs_t *container,
+                                   apr_pool_t *scratch_pool);
+
+/* Read a noderev container from its serialized representation in STREAM.
+ * Allocate the result in RESULT_POOL and return it in *CONTAINER.  Use
+ * SCRATCH_POOL for temporary allocations.
+ */
+svn_error_t *
+svn_fs_x__read_noderevs_container(svn_fs_x__noderevs_t **container,
+                                   svn_stream_t *stream,
+                                   apr_pool_t *result_pool,
+                                   apr_pool_t *scratch_pool);
+
+/* Implements #svn_cache__serialize_func_t for svn_fs_x__noderevs_t
+ * objects.
+ */
+svn_error_t *
+svn_fs_x__serialize_noderevs_container(void **data,
+                                        apr_size_t *data_len,
+                                        void *in,
+                                        apr_pool_t *pool);
+
+/* Implements #svn_cache__deserialize_func_t for svn_fs_x__noderevs_t
+ * objects.
+ */
+svn_error_t *
+svn_fs_x__deserialize_noderevs_container(void **out,
+                                          void *data,
+                                          apr_size_t data_len,
+                                          apr_pool_t *pool);
+
+/* Implements svn_cache__partial_getter_func_t for svn_fs_x__noderevs_t,
+ * setting *OUT to the svn_fs_x__noderev_t selected by the apr_uint32_t index
+ * passed in as *BATON.  This function is similar to svn_fs_x__noderevs_get
+ * but operates on the cache serialized representation of the container.
+ */
+svn_error_t *
+svn_fs_x__noderevs_get_func(void **out,
+                             const void *data,
+                             apr_size_t data_len,
+                             void *baton,
+                             apr_pool_t *pool);
+
+/* Implements svn_cache__partial_getter_func_t for the mergeinfo_count in
+ * the stored noderevs, setting *OUT to the apr_int64_t counter value of
+ * the noderev selected by the apr_uint32_t index passed in as *BATON.
+ */
+svn_error_t *
+svn_fs_x__mergeinfo_count_get_func(void **out,
+                                   const void *data,
+                                   apr_size_t data_len,
+                                   void *baton,
+                                   apr_pool_t *pool);
+
+#endif