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diff --git a/subversion/libsvn_fs_x/fs_id.h b/subversion/libsvn_fs_x/fs_id.h
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index 000000000000..6d6a08ac3649
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+++ b/subversion/libsvn_fs_x/fs_id.h
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+/* fs_id.h : FSX's implementation of svn_fs_id_t
+ *
+ * ====================================================================
+ *    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_FS_ID_H
+#define SVN_LIBSVN_FS_X_FS_ID_H
+
+#include "id.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Transparent FS access object to be used with FSX's implementation for
+   svn_fs_id_t.  It allows the ID object query data from the respective FS
+   to check for node relationships etc.  It also allows to re-open the repo
+   after the original svn_fs_t object got cleaned up, i.e. the ID object's
+   functionality does not depend on any other object's lifetime.
+
+   For efficiency, multiple svn_fs_id_t should share the same context.
+ */
+typedef struct svn_fs_x__id_context_t svn_fs_x__id_context_t;
+
+/* Return a context object for filesystem FS; construct it in RESULT_POOL. */
+svn_fs_x__id_context_t *
+svn_fs_x__id_create_context(svn_fs_t *fs,
+                            apr_pool_t *result_pool);
+
+/* Create a permanent ID based on NODEREV_ID, allocated in RESULT_POOL.
+   For complex requests, access the filesystem provided with CONTEXT.
+
+   For efficiency, CONTEXT should have been created in RESULT_POOL and be
+   shared between multiple ID instances allocated in the same pool.
+ */
+svn_fs_id_t *
+svn_fs_x__id_create(svn_fs_x__id_context_t *context,
+                    const svn_fs_x__id_t *noderev_id,
+                    apr_pool_t *result_pool);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_LIBSVN_FS_X_FS_ID_H */