Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_map_module.xml @ 2291:3294470932c5
Documented the "delay" parameter for limit_req.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 27 Nov 2018 20:31:05 +0300 |
parents | c6b5826b64f7 |
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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="Module ngx_stream_map_module" |
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11 link="/en/docs/stream/ngx_stream_map_module.html" |
589 | 12 lang="en" |
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13 rev="2"> |
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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 The <literal>ngx_stream_map_module</literal> module (1.11.2) creates variables |
348
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19 whose values depend on values of other variables. |
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20 </para> |
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21 |
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22 </section> |
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23 |
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24 |
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25 <section id="example" name="Example Configuration"> |
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26 |
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27 <para> |
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28 <example> |
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29 map $remote_addr $limit { |
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30 127.0.0.1 ""; |
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31 default $binary_remote_addr; |
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32 } |
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33 |
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34 limit_conn_zone $limit zone=addr:10m; |
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35 limit_conn addr 1; |
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36 </example> |
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37 </para> |
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38 |
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39 </section> |
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40 |
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41 |
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42 <section id="directives" name="Directives"> |
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43 |
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44 <directive name="map"> |
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45 <syntax block="yes"> |
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46 <value>string</value> |
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47 <value>$variable</value></syntax> |
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48 <default/> |
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49 <context>stream</context> |
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50 |
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51 <para> |
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52 Creates a new variable whose value |
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53 depends on values of one or more of the source variables |
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54 specified in the first parameter. |
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55 </para> |
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56 |
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57 <para> |
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58 <note> |
966 | 59 Since variables are evaluated only when they are used, the mere declaration |
60 even of a large number of “<literal>map</literal>” variables | |
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61 does not add any extra costs to connection processing. |
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62 </note> |
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63 </para> |
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64 |
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65 <para> |
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66 Parameters inside the <literal>map</literal> block specify a mapping |
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67 between source and resulting values. |
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68 </para> |
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69 |
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70 <para> |
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71 Source values are specified as strings or regular expressions. |
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72 </para> |
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73 |
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74 <para> |
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75 Strings are matched ignoring the case. |
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76 </para> |
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77 |
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78 <para> |
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79 A regular expression should either start from the “<literal>~</literal>” |
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80 symbol for a case-sensitive matching, or from the “<literal>~*</literal>” |
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81 symbols for case-insensitive matching. |
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82 A regular expression can contain named and positional captures |
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83 that can later be used in other directives along with the |
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84 resulting variable. |
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85 </para> |
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86 |
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87 <para> |
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88 If a source value matches one of the names of special parameters |
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89 described below, it should be prefixed with the “<literal>\</literal>” symbol. |
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90 </para> |
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91 |
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92 <para> |
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93 The resulting value can contain text, |
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94 variable, and their combination. |
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95 </para> |
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96 |
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97 <para> |
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98 The following special parameters are also supported: |
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99 <list type="tag"> |
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100 <tag-name><literal>default</literal> <value>value</value></tag-name> |
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101 <tag-desc> |
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102 sets the resulting value if the source value matches none |
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103 of the specified variants. |
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104 When <literal>default</literal> is not specified, the default |
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105 resulting value will be an empty string. |
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106 </tag-desc> |
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107 |
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108 <tag-name><literal>hostnames</literal></tag-name> |
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109 <tag-desc> |
966 | 110 indicates that source values can be hostnames with a prefix or suffix mask: |
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111 <example> |
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112 *.example.com 1; |
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113 example.* 1; |
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114 </example> |
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115 The following two records |
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116 <example> |
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117 example.com 1; |
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118 *.example.com 1; |
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119 </example> |
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120 can be combined: |
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121 <example> |
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122 .example.com 1; |
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123 </example> |
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124 This parameter should be specified before the list of values. |
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125 </tag-desc> |
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126 |
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127 <tag-name><literal>include</literal> <value>file</value></tag-name> |
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128 <tag-desc> |
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129 includes a file with values. |
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130 There can be several inclusions. |
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131 </tag-desc> |
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132 |
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133 <tag-name id="volatile"><literal>volatile</literal></tag-name> |
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134 <tag-desc> |
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135 indicates that the variable is not cacheable (1.11.7). |
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136 </tag-desc> |
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137 |
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138 </list> |
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139 </para> |
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140 |
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141 <para> |
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142 If the source value matches more than one of the specified variants, |
966 | 143 e.g. both a mask and a regular expression match, the first matching |
144 variant will be chosen, in the following order of priority: | |
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145 <list type="enum"> |
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146 |
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147 <listitem> |
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148 string value without a mask |
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149 </listitem> |
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150 |
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151 <listitem> |
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152 longest string value with a prefix mask, |
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153 e.g. “<literal>*.example.com</literal>” |
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154 </listitem> |
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155 |
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156 <listitem> |
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157 longest string value with a suffix mask, |
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158 e.g. “<literal>mail.*</literal>” |
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159 </listitem> |
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160 |
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161 <listitem> |
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162 first matching regular expression |
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163 (in order of appearance in a configuration file) |
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164 </listitem> |
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165 |
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166 <listitem> |
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167 default value |
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168 </listitem> |
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169 |
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170 </list> |
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171 </para> |
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172 |
348
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173 </directive> |
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174 |
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175 |
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176 <directive name="map_hash_bucket_size"> |
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177 <syntax><value>size</value></syntax> |
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178 <default>32|64|128</default> |
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179 <context>stream</context> |
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180 |
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181 <para> |
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182 Sets the bucket size for the <link id="map"/> variables hash tables. |
966 | 183 Default value depends on the processor’s cache line size. |
184 The details of setting up hash tables are provided in a separate | |
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185 <link doc="../hash.xml">document</link>. |
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186 </para> |
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187 |
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188 </directive> |
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189 |
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190 |
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191 <directive name="map_hash_max_size"> |
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192 <syntax><value>size</value></syntax> |
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193 <default>2048</default> |
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194 <context>stream</context> |
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195 |
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196 <para> |
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197 Sets the maximum <value>size</value> of the <link id="map"/> variables |
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198 hash tables. |
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200 <link doc="../hash.xml">document</link>. |
348
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201 </para> |
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202 |
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203 </directive> |
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204 |
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205 </section> |
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206 |
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207 </module> |