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diff --git a/common/collection/collection_priv.h b/common/collection/collection_priv.h
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+/*
+    COLLECTION LIBRARY
+
+    Header file for internal structures used by the collection interface.
+
+    Copyright (C) Dmitri Pal <dpal@redhat.com> 2009
+
+    Collection Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Collection Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with Collection Library.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef COLLECTION_PRIV_H
+#define COLLECTION_PRIV_H
+
+/* Define real strcutures */
+/* Structure that holds one property.
+ * This structure should never be assumed and used directly other than
+ * inside the collection.c that contains actual implementation or
+ * collection_tools.c or collection_utils.c.
+ */
+struct collection_item {
+    /* Member that contains element linking information.
+     * This member should never be directly accessed by an application.
+     */
+    struct collection_item *next;
+
+    /* Your implementation can assume that these members
+     * will always be members of the collection_item.
+     * but you should use get_item_xxx functions to get them.
+     */
+    char *property;
+    int property_len;
+    int type;
+    int length;
+    void *data;
+};
+
+
+/* Internal iterator structure - exposed for reference.
+ * Never access internals of this structure in your application.
+ */
+struct collection_iterator {
+    struct collection_item *top;
+    struct collection_item **stack;
+    unsigned stack_size;
+    unsigned stack_depth;
+    int flags;
+};
+
+
+/* Special type of data that stores collection header information. */
+struct collection_header {
+    struct collection_item *last;
+    unsigned reference_count;
+    unsigned count;
+    unsigned class;
+};
+
+#endif
+