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diff --git a/rubbos/app/apache2/include/util_cfgtree.h b/rubbos/app/apache2/include/util_cfgtree.h
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+/* 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 AP_CONFTREE_H
+#define AP_CONFTREE_H
+
+#include "ap_config.h"
+
+/**
+ * @package Config Tree Package
+ */
+
+typedef struct ap_directive_t ap_directive_t;
+
+/**
+ * Structure used to build the config tree.  The config tree only stores
+ * the directives that will be active in the running server.  Directives
+ * that contain other directions, such as <Directory ...> cause a sub-level
+ * to be created, where the included directives are stored.  The closing
+ * directive (</Directory>) is not stored in the tree.
+ */
+struct ap_directive_t {
+    /** The current directive */
+    const char *directive;
+    /** The arguments for the current directive, stored as a space 
+     *  separated list */
+    const char *args;
+    /** The next directive node in the tree
+     *  @defvar ap_directive_t *next */
+    struct ap_directive_t *next;
+    /** The first child node of this directive 
+     *  @defvar ap_directive_t *first_child */
+    struct ap_directive_t *first_child;
+    /** The parent node of this directive 
+     *  @defvar ap_directive_t *parent */
+    struct ap_directive_t *parent;
+
+    /** directive's module can store add'l data here */
+    void *data;
+
+    /* ### these may go away in the future, but are needed for now */
+    /** The name of the file this directive was found in */
+    const char *filename;
+    /** The line number the directive was on */
+    int line_num;
+};
+
+/**
+ * The root of the configuration tree
+ * @defvar ap_directive_t *conftree
+ */
+AP_DECLARE_DATA extern ap_directive_t *ap_conftree;
+
+/**
+ * Add a node to the configuration tree.
+ * @param parent The current parent node.  If the added node is a first_child,
+                 then this is changed to the current node
+ * @param current The current node
+ * @param toadd The node to add to the tree
+ * @param child Is the node to add a child node
+ * @return the added node
+ */
+ap_directive_t *ap_add_node(ap_directive_t **parent, ap_directive_t *current, 
+                            ap_directive_t *toadd, int child);
+
+#endif