Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_map_module.xml @ 702:6b6585577c33
Slightly changed the wording when talking about the "rewrite_log" directive.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Thu, 04 Oct 2012 08:27:40 +0000 |
parents | 77a3314c74a7 |
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rev | line source |
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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_http_map_module" |
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11 link="/en/docs/http/ngx_http_map_module.html" |
589 | 12 lang="en" |
13 rev="1"> | |
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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_http_map_module</literal> module creates variables |
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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 $http_host $name { |
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30 hostnames; |
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31 |
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32 default 0; |
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33 |
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34 example.com 1; |
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35 *.example.com 1; |
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36 example.org 2; |
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37 *.example.org 2; |
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38 .example.net 3; |
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39 wap.* 4; |
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40 } |
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41 |
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42 map $http_user_agent $mobile { |
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43 default 0; |
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44 "~Opera Mini" 1; |
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45 } |
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46 </example> |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
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52 <section id="directives" name="Directives"> |
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53 |
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54 <directive name="map"> |
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55 <syntax block="yes"> |
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56 <value>string</value> |
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57 <value>$variable</value></syntax> |
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58 <default/> |
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59 <context>http</context> |
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60 |
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61 <para> |
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62 Creates a new variable whose value |
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63 depends on values of one or more of the source variables |
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64 specified in the first parameter. |
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65 <note> |
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66 Before version 0.9.0 only a single variable could be |
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67 specified in the first parameter. |
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68 </note> |
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69 </para> |
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70 |
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71 <para> |
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72 Parameters inside the <literal>map</literal> block specify a mapping |
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73 between source and resulting values. |
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74 </para> |
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75 |
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76 <para> |
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77 Source values are specified as strings or regular expressions (0.9.6). |
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78 </para> |
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79 |
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80 <para> |
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81 A regular expression should either start from the “<literal>~</literal>” |
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82 symbol for a case-sensitive matching, or from the “<literal>~*</literal>” |
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83 symbols (1.0.4) for case-insensitive matching. |
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84 A regular expression can contain named and positional captures |
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85 that can later be used in other directives along with the |
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86 resulting variable. |
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87 </para> |
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88 |
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89 <para> |
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90 If a source value matches one of the names of special parameters |
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91 described below, it should be prefixed with the “<literal>\</literal>” symbol. |
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92 </para> |
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93 |
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94 <para> |
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95 The resulting value can be a string |
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96 or another variable (0.9.0). |
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97 </para> |
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98 |
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99 <para> |
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100 The directive also supports three special parameters: |
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101 <list type="tag"> |
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102 <tag-name><literal>default</literal> <value>value</value></tag-name> |
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103 <tag-desc> |
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104 sets the resulting value if the source value matches none |
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105 of the specified variants. |
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106 When <literal>default</literal> is not specified, the default |
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107 resulting value will be an empty string. |
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108 </tag-desc> |
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109 |
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110 <tag-name><literal>hostnames</literal></tag-name> |
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111 <tag-desc> |
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112 allows to specify hostnames with a prefix or suffix mask, as source |
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113 values, for example, |
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114 <example> |
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115 *.example.com 1; |
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116 example.* 1; |
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117 </example> |
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118 The following two records |
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119 <example> |
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120 example.com 1; |
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121 *.example.com 1; |
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122 </example> |
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123 can be combined: |
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124 <example> |
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125 .example.com 1; |
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126 </example> |
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127 This parameter should be specified before the list of values. |
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128 </tag-desc> |
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129 |
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130 <tag-name><literal>include</literal> <value>file</value></tag-name> |
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131 <tag-desc> |
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132 includes a file with values. |
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133 There can be several inclusions. |
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134 </tag-desc> |
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135 |
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136 </list> |
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137 </para> |
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138 |
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139 <para> |
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140 If the source value matches more than one of the specified variants, |
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141 e.g. both mask and regular expression match, the first matching |
627 | 142 variant will be chosen, in the following order of precedence: |
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143 <list type="enum"> |
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144 |
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145 <listitem> |
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146 string value without a mask |
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147 </listitem> |
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148 |
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149 <listitem> |
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150 longest string value with a prefix mask, |
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151 e.g. “<literal>*.example.com</literal>” |
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152 </listitem> |
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153 |
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154 <listitem> |
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155 longest string value with a suffix mask, |
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156 e.g. “<literal>mail.*</literal>” |
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157 </listitem> |
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158 |
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159 <listitem> |
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160 first matching regular expression |
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161 (in order of appearance in a configuration file) |
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162 </listitem> |
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163 |
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164 <listitem> |
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165 default value |
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166 </listitem> |
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167 |
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168 </list> |
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169 </para> |
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170 |
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171 </directive> |
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172 |
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173 |
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174 <directive name="map_hash_bucket_size"> |
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175 <syntax><value>size</value></syntax> |
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176 <default>32|64|128</default> |
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177 <context>http</context> |
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178 |
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179 <para> |
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180 Sets the bucket size for the <link id="map"/> variables hash tables. |
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181 Default value depends on the size of the processor’s cache line. |
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182 Details of setting up hash tables are provided in a separate |
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183 <link doc="../hash.xml">document</link>. |
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184 </para> |
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185 |
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186 </directive> |
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187 |
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188 |
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189 <directive name="map_hash_max_size"> |
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190 <syntax><value>size</value></syntax> |
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191 <default>2048</default> |
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192 <context>http</context> |
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193 |
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194 <para> |
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195 Sets the maximum <value>size</value> of the <link id="map"/> variables |
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196 hash tables. |
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197 Details of setting up hash tables are provided in a separate |
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198 <link doc="../hash.xml">document</link>. |
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199 </para> |
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200 |
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201 </directive> |
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202 |
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203 </section> |
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204 |
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205 </module> |