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diff --git a/subversion/libsvn_ra_serf/blncache.h b/subversion/libsvn_ra_serf/blncache.h
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+++ b/subversion/libsvn_ra_serf/blncache.h
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+/*
+ * blncache.h: DAV baseline information cache.
+ *
+ * ====================================================================
+ *    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_RA_SERF_BLNCACHE_H
+#define SVN_LIBSVN_RA_SERF_BLNCACHE_H
+
+#include <apr_pools.h>
+
+#include "svn_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* Baseline information cache. Baseline information cache holds information
+ * about DAV baseline (bln):
+ * 1. URL of the baseline (bln)
+ * 2. Revision number associated with baseline
+ * 3. URL of baseline collection (bc).
+ */
+typedef struct svn_ra_serf__blncache_t svn_ra_serf__blncache_t;
+
+/* Creates new instance of baseline cache. Sets BLNCACHE_P with
+ * a pointer to new instance, allocated in POOL.
+ */
+svn_error_t *
+svn_ra_serf__blncache_create(svn_ra_serf__blncache_t **blncache_p,
+                             apr_pool_t *pool);
+
+/* Add information about baseline. BLNCACHE is a pointer to
+ * baseline cache previously created using svn_ra_serf__blncache_create
+ * function. BASELINE_URL is URL of baseline (can be NULL if unknown).
+ * REVNUM is revision number associated with baseline. Use SVN_INVALID_REVNUM
+ * to indicate that revision is unknown.
+ * BC_URL is URL of baseline collection (can be NULL if unknwon).
+ */
+svn_error_t *
+svn_ra_serf__blncache_set(svn_ra_serf__blncache_t *blncache,
+                          const char *baseline_url,
+                          svn_revnum_t revnum,
+                          const char *bc_url,
+                          apr_pool_t *pool);
+
+/* Sets *BC_URL_P with a pointer to baseline collection URL for the given
+ * REVNUM. *BC_URL_P will be NULL if cache doesn't have information about
+ * this baseline.
+ */
+svn_error_t *
+svn_ra_serf__blncache_get_bc_url(const char **bc_url_p,
+                                 svn_ra_serf__blncache_t *blncache,
+                                 svn_revnum_t revnum,
+                                 apr_pool_t *pool);
+
+/* Sets *BC_URL_P with pointer to baseline collection URL and *REVISION_P
+ * with revision number of baseline BASELINE_URL. *BC_URL_P will be NULL,
+ * *REVNUM_P will SVN_INVALID_REVNUM if cache doesn't have such
+ * information.
+ */
+svn_error_t *
+svn_ra_serf__blncache_get_baseline_info(const char **bc_url_p,
+                                        svn_revnum_t *revnum_p,
+                                        svn_ra_serf__blncache_t *blncache,
+                                        const char *baseline_url,
+                                        apr_pool_t *pool);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_LIBSVN_RA_SERF_BLNCACHE_H*/