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annotate xml/ru/docs/http/ngx_http_headers_module.xml @ 2593:eeed494bba51

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Unified phrases about configuration levels and inheritance.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 21 Sep 2020 15:45:07 +0300
parents 375a3dfde23b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Модуль ngx_http_headers_module"
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11 link="/ru/docs/http/ngx_http_headers_module.html"
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12 lang="ru"
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13 rev="13">
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14
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15 <section id="summary">
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16
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17 <para>
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18 Модуль <literal>ngx_http_headers_module</literal> позволяет выдавать
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19 поля заголовка <header>Expires</header> и <header>Cache-Control</header>,
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20 а также добавлять произвольные поля в заголовок ответа.
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21 </para>
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22
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23 </section>
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24
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25
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26 <section id="example" name="Пример конфигурации">
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27
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28 <para>
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29 <example>
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30 expires 24h;
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31 expires modified +24h;
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32 expires @24h;
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33 expires 0;
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34 expires -1;
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35 expires epoch;
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36 expires $expires;
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37 add_header Cache-Control private;
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38 </example>
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="directives" name="Директивы">
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45
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46 <directive name="add_header">
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47 <syntax>
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48 <value>имя</value> <value>значение</value>
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49 [<literal>always</literal>]</syntax>
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50 <default/>
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51 <context>http</context>
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52 <context>server</context>
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53 <context>location</context>
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54 <context>if в location</context>
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55
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56 <para>
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57 Добавляет указанное поле в заголовок ответа при условии, что код ответа
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58 равен 200, 201 (1.3.10), 204, 206, 301, 302, 303, 304,
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59 307 (1.1.16, 1.0.13) или 308 (1.13.0).
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60 В значении параметра можно использовать переменные.
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61 </para>
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62
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63 <para>
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64 Директив <literal>add_header</literal> может быть несколько.
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65 Директивы наследуются с предыдущего уровня конфигурации при условии, что
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66 на данном уровне не описаны свои директивы <literal>add_header</literal>.
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67 </para>
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68
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69 <para>
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70 Если указан параметр <literal>always</literal> (1.7.5),
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71 то поле заголовка будет добавлено независимо от кода ответа.
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72 </para>
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73
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74 </directive>
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77 <directive name="add_trailer">
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78 <syntax>
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79 <value>имя</value> <value>значение</value>
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80 [<literal>always</literal>]</syntax>
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81 <default/>
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82 <context>http</context>
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83 <context>server</context>
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84 <context>location</context>
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85 <context>if в location</context>
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86 <appeared-in>1.13.2</appeared-in>
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87
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88 <para>
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89 Добавляет указанное поле в конец ответа при условии, что код ответа
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90 равен 200, 201, 206, 301, 302, 303, 307 или 308.
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91 В значении можно использовать переменные.
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92 </para>
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93
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94 <para>
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95 Директив <literal>add_trailer</literal> может быть несколько.
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96 Директивы наследуются с предыдущего уровня конфигурации при условии, что
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97 на данном уровне не описаны свои директивы <literal>add_trailer</literal>.
2002
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98 </para>
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99
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100 <para>
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101 Если указан параметр <literal>always</literal>,
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102 то указанное поле будет добавлено независимо от кода ответа.
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103 </para>
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104
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105 </directive>
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106
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107
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108 <directive name="expires">
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109 <syntax>[<literal>modified</literal>] <value>время</value></syntax>
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110 <syntax>
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111 <literal>epoch</literal> |
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112 <literal>max</literal> |
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113 <literal>off</literal></syntax>
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114 <default>off</default>
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115 <context>http</context>
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116 <context>server</context>
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117 <context>location</context>
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118 <context>if в location</context>
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119
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120 <para>
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121 Разрешает или запрещает добавлять или менять поля <header>Expires</header>
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122 и <header>Cache-Control</header> в заголовке ответа при условии, что код ответа
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123 равен 200, 201 (1.3.10), 204, 206, 301, 302, 303, 304,
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124 307 (1.1.16, 1.0.13) или 308 (1.13.0).
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125 В качестве параметра можно задать положительное или отрицательное
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126 <link doc="../syntax.xml">время</link>.
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127 </para>
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128
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129 <para>
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130 Время в поле <header>Expires</header> получается как сумма текущего времени
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131 и времени, заданного в директиве.
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132 Если используется параметр <literal>modified</literal> (0.7.0, 0.6.32),
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133 то время получается как сумма
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134 времени модификации файла и времени, заданного в директиве.
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135 </para>
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136
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137 <para>
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138 Кроме того, с помощью префикса “<literal>@</literal>” можно задать
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139 время суток (0.7.9, 0.6.34):
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140 <example>
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141 expires @15h30m;
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142 </example>
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143 </para>
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144
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145 <para>
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146 Содержимое поля <header>Cache-Control</header> зависит от знака
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147 заданного времени:
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148 <list type="bullet">
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149
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150 <listitem>
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151 отрицательное время — <header>Cache-Control: no-cache</header>.
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152 </listitem>
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153
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154 <listitem>
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155 положительное или равное нулю время —
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156 <header>Cache-Control: max-age=<value>t</value></header>,
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157 где <value>t</value> это время в секундах, заданное в директиве.
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158 </listitem>
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159
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160 </list>
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161 </para>
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162
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163 <para>
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164 Параметр <literal>epoch</literal> задаёт время
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165 “<literal>Thu, 01 Jan 1970 00:00:01 GMT</literal>”
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166 (1 января 1970 00:00:01 GMT) для поля <header>Expires</header>
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167 и “<literal>no-cache</literal>” для поля <header>Cache-Control</header>.
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168 </para>
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169
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170 <para>
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171 Параметр <literal>max</literal> задаёт время
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172 “<literal>Thu, 31 Dec 2037 23:55:55 GMT</literal>”
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173 (31 декабря 2037 23:55:55 GMT) для поля <header>Expires</header>
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174 и 10 лет для поля <header>Cache-Control</header>.
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175 </para>
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176
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177 <para>
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178 Параметр <literal>off</literal> запрещает добавлять или менять поля
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179 <header>Expires</header> и <header>Cache-Control</header> в заголовке ответа.
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180 </para>
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181
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182 <para>
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183 В значении последнего параметра можно использовать переменные (1.7.9):
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184 <example>
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185 map $sent_http_content_type $expires {
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186 default off;
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187 application/pdf 42d;
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188 ~image/ max;
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189 }
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190
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191 expires $expires;
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192 </example>
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193 </para>
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194
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195 </directive>
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196
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197 </section>
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198
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199 </module>