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diff --git a/subversion/libsvn_fs_x/string_table.h b/subversion/libsvn_fs_x/string_table.h
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+/* string_table.h : interface to string tables, private to libsvn_fs_x
+ *
+ * ====================================================================
+ *    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_X_STRING_TABLE_H
+#define SVN_LIBSVN_FS_X_STRING_TABLE_H
+
+#include "svn_io.h"
+#include "private/svn_temp_serializer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* A string table is a very space efficient, read-only representation for
+ * a set of strings with high degreed of prefix and postfix overhead.
+ *
+ * Creating a string table is a two-stage process:  Use a builder class,
+ * stuff all the strings in there and let it then do the heavy lifting of
+ * classification and compression to create the actual string table object.
+ *
+ * We will use this for the various path values in FSX change lists and
+ * node revision items.
+ */
+
+/* the string table builder */
+typedef struct string_table_builder_t string_table_builder_t;
+
+/* the string table */
+typedef struct string_table_t string_table_t;
+
+/* Returns a new string table builder object, allocated in RESULT_POOL.
+ */
+string_table_builder_t *
+svn_fs_x__string_table_builder_create(apr_pool_t *result_pool);
+
+/* Add an arbitrary NUL-terminated C-string STRING of the given length LEN
+ * to BUILDER.  Return the index of that string in the future string table.
+ * If LEN is 0, determine the length of the C-string internally.
+ */
+apr_size_t
+svn_fs_x__string_table_builder_add(string_table_builder_t *builder,
+                                   const char *string,
+                                   apr_size_t len);
+
+/* Return an estimate for the on-disk size of the resulting string table.
+ * The estimate may err in both directions but tends to overestimate the
+ * space requirements for larger tables.
+ */
+apr_size_t
+svn_fs_x__string_table_builder_estimate_size(string_table_builder_t *builder);
+
+/* From the given BUILDER object, create a string table object allocated
+ * in POOL that contains all strings previously added to BUILDER.
+ */
+string_table_t *
+svn_fs_x__string_table_create(const string_table_builder_t *builder,
+                              apr_pool_t *pool);
+
+/* Extract string number INDEX from TABLE and return a copy of it allocated
+ * in POOL.  If LENGTH is not NULL, set *LENGTH to strlen() of the result
+ * string.  Returns an empty string for invalid indexes.
+ */
+const char*
+svn_fs_x__string_table_get(const string_table_t *table,
+                           apr_size_t index,
+                           apr_size_t *length,
+                           apr_pool_t *pool);
+
+/* Write a serialized representation of the string table TABLE to STREAM.
+ * Use SCRATCH_POOL for temporary allocations.
+ */
+svn_error_t *
+svn_fs_x__write_string_table(svn_stream_t *stream,
+                             const string_table_t *table,
+                             apr_pool_t *scratch_pool);
+
+/* Read the serialized string table representation from STREAM and return
+ * the resulting runtime representation in *TABLE_P.  Allocate it in
+ * RESULT_POOL and use SCRATCH_POOL for temporary allocations.
+ */
+svn_error_t *
+svn_fs_x__read_string_table(string_table_t **table_p,
+                            svn_stream_t *stream,
+                            apr_pool_t *result_pool,
+                            apr_pool_t *scratch_pool);
+
+/* Serialize string table *ST within the serialization CONTEXT.
+ */
+void
+svn_fs_x__serialize_string_table(svn_temp_serializer__context_t *context,
+                                 string_table_t **st);
+
+/* Deserialize string table *TABLE within the BUFFER.
+ */
+void
+svn_fs_x__deserialize_string_table(void *buffer,
+                                   string_table_t **table);
+
+/* Extract string number INDEX from the cache serialized representation at
+ * TABLE and return a copy of it allocated in POOL.  If LENGTH is not NULL,
+ * set *LENGTH to strlen() of the result string.  Returns an empty string
+ * for invalid indexes.
+ */
+const char*
+svn_fs_x__string_table_get_func(const string_table_t *table,
+                                apr_size_t idx,
+                                apr_size_t *length,
+                                apr_pool_t *pool);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_LIBSVN_FS_X_STRING_TABLE_H */