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annotate xml/ru/docs/stream/ngx_stream_map_module.xml @ 1743:3d686cb47c2c

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Documented the map module in stream.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 05 Jul 2016 17:58:34 +0300
parents xml/ru/docs/http/ngx_http_map_module.xml@8aa362a99f7c
children c6b5826b64f7
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_stream_map_module"
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11 link="/ru/docs/stream/ngx_stream_map_module.html"
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12 lang="ru"
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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 Модуль <literal>ngx_stream_map_module</literal> (1.11.2) создаёт переменные,
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19 значения которых зависят от значений других переменных.
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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="Пример конфигурации">
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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 $limit zone=addr:10m;
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35 limit_conn addr 1;
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36 </example>
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37 </para>
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38
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39 </section>
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40
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41
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42 <section id="directives" name="Директивы">
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43
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44 <directive name="map">
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45 <syntax block="yes">
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46 <value>строка</value>
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47 <value>$переменная</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 Создаёт новую переменную, значение которой
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53 зависит от значений одной или более исходных переменных,
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54 указанных в первом параметре.
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55 </para>
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56
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57 <para>
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58 <note>
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59 Поскольку переменные вычисляются только в момент использования,
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60 само по себе наличие даже большого числа объявлений переменных
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61 “<literal>map</literal>” не влечёт за собой никаких дополнительных
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62 расходов на обработку соединений.
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63 </note>
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64 </para>
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65
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66 <para>
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67 Параметры внутри блока <literal>map</literal> задают соответствие
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68 между исходными и результирующими значениями.
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69 </para>
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70
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71 <para>
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72 Исходные значения задаются строками или регулярными выражениями.
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73 </para>
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74
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75 <para>
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76 Строки проверяются без учёта регистра.
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77 </para>
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78
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79 <para>
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80 Перед регулярным выражением ставится символ “<literal>~</literal>”,
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81 если при сравнении следует учитывать регистр символов, либо символы
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82 “<literal>~*</literal>”, если регистр символов учитывать не нужно.
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83 Регулярное выражение может содержать именованные и позиционные выделения,
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84 которые могут затем использоваться в других директивах совместно с
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85 результирующей переменной.
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86 </para>
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87
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88 <para>
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89 Если исходное значение совпадает с именем одного из специальных параметров,
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90 описанных ниже, перед ним следует поставить символ “<literal>\</literal>”.
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91 </para>
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92
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93 <para>
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94 В качестве результирующего значения можно указать текст,
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95 переменную и их комбинации.
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96 </para>
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97
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98 <para>
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99 Директива также поддерживает три специальных параметра:
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100 <list type="tag">
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101 <tag-name><literal>default</literal> <value>значение</value></tag-name>
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102 <tag-desc>
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103 задаёт результирующее значение, если исходное значение не
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104 совпадает ни с одним из перечисленных.
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105 Если параметр <literal>default</literal> не указан, результирующим значением
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106 по умолчанию будет пустая строка.
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107 </tag-desc>
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108
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109 <tag-name><literal>hostnames</literal></tag-name>
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110 <tag-desc>
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111 указывает, что в качестве исходных значений можно
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112 использовать маску для первой или последней части имени хоста, например,
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113 <example>
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114 *.example.com 1;
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115 example.* 1;
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116 </example>
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117 Вместо двух записей
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118 <example>
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119 example.com 1;
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120 *.example.com 1;
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121 </example>
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122 можно использовать одну:
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123 <example>
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124 .example.com 1;
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125 </example>
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126 Этот параметр следует указывать перед списком значений.
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127 </tag-desc>
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128
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129 <tag-name><literal>include</literal> <value>файл</value></tag-name>
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130 <tag-desc>
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131 включает файл со значениями.
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132 Включений может быть несколько.
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133 </tag-desc>
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134
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135 </list>
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136 </para>
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137
572
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138 <para>
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139 Если исходному значению соответствует несколько из указанных вариантов,
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140 например, одновременно подходят и маска, и регулярное выражение,
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141 будет выбран первый подходящий вариант в следующем порядке приоритета:
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142 <list type="enum">
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143
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144 <listitem>
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145 строковое значение без маски
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146 </listitem>
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147
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148 <listitem>
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149 самое длинное строковое значение с маской в начале,
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150 например “<literal>*.example.com</literal>”
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151 </listitem>
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152
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153 <listitem>
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154 самое длинное строковое значение с маской в конце,
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155 например “<literal>mail.*</literal>”
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156 </listitem>
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157
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158 <listitem>
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159 первое подходящее регулярное выражение
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160 (в порядке следования в конфигурационном файле)
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161 </listitem>
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162
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163 <listitem>
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164 значение по умолчанию (<literal>default</literal>)
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165 </listitem>
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166
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167 </list>
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168 </para>
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169
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170 </directive>
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171
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172
346
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173 <directive name="map_hash_bucket_size">
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174 <syntax><value>размер</value></syntax>
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175 <default>32|64|128</default>
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176 <context>stream</context>
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177
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178 <para>
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179 Задаёт размер корзины в хэш-таблицах для переменных <link id="map"/>.
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180 Значение по умолчанию зависит от размера строки кэша процессора.
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181 Подробнее настройка хэш-таблиц обсуждается в отдельном
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182 <link doc="../hash.xml">документе</link>.
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183 </para>
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184
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185 </directive>
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186
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187
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188 <directive name="map_hash_max_size">
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189 <syntax><value>размер</value></syntax>
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190 <default>2048</default>
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191 <context>stream</context>
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192
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193 <para>
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194 Задаёт максимальный размер хэш-таблиц для переменных <link id="map"/>.
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195 Подробнее настройка хэш-таблиц обсуждается в отдельном
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196 <link doc="../hash.xml">документе</link>.
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197 </para>
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198
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199 </directive>
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200
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201 </section>
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202
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203 </module>