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diff --git a/subversion/include/svn_opt_impl.h b/subversion/include/svn_opt_impl.h
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+/**
+ * @copyright
+ * ====================================================================
+ *    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.
+ * ====================================================================
+ * @endcopyright
+ *
+ * @file svn_opt_impl.h
+ * @brief Option and argument parsing for Subversion command lines
+ *        (common implementation)
+ *
+ * @warning This is a @b private implementation-specific header file.
+ *          User code should include @ref svn_opt.h instead.
+ */
+
+/* NOTE:
+ * This file *must not* include or depend on any other header except
+ * the C standard library headers.
+ */
+
+#ifndef SVN_OPT_IMPL_H
+#define SVN_OPT_IMPL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+/**
+ * Various ways of specifying revisions.
+ *
+ * @note
+ * In contexts where local mods are relevant, the `working' kind
+ * refers to the uncommitted "working" revision, which may be modified
+ * with respect to its base revision.  In other contexts, `working'
+ * should behave the same as `committed' or `current'.
+ */
+/* NOTE: Update svnxx/revision.hpp when changing this enum. */
+enum svn_opt_revision_kind {
+  /** No revision information given. */
+  svn_opt_revision_unspecified,
+
+  /** revision given as number */
+  svn_opt_revision_number,
+
+  /** revision given as date */
+  svn_opt_revision_date,
+
+  /** rev of most recent change */
+  svn_opt_revision_committed,
+
+  /** (rev of most recent change) - 1 */
+  svn_opt_revision_previous,
+
+  /** .svn/entries current revision */
+  svn_opt_revision_base,
+
+  /** current, plus local mods */
+  svn_opt_revision_working,
+
+  /** repository youngest */
+  svn_opt_revision_head
+
+  /* please update svn_opt__revision_to_string() when extending this enum */
+};
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_OPT_IMPL_H */