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Update _VERSION, makefile, README and documentation to 1.3.0
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1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" |
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2 | "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
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3 | <html> |
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4 | <head> |
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5 | <title>LuaExpat: XML Expat parsing for the Lua programming language</title> |
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6 | <link rel="stylesheet" href="http://www.keplerproject.org/doc.css" type="text/css"/> |
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7 | <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> |
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8 | </head> |
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9 | <body> |
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10 | |
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11 | <div id="container"> |
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12 | |
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13 | <div id="product"> |
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14 | <div id="product_logo"><a href="http://www.keplerproject.org"> |
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15 | <img alt="LuaExpat logo" src="luaexpat.png"/> |
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16 | </a></div> |
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17 | <div id="product_name"><big><strong>LuaExpat</strong></big></div> |
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18 | <div id="product_description">XML Expat parsing for the Lua programming language</div> |
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19 | </div> <!-- id="product" --> |
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20 | |
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21 | <div id="main"> |
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22 | |
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23 | <div id="navigation"> |
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24 | <h1>LuaExpat</h1> |
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25 | <ul> |
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26 | <li><a href="index.html">Home</a> |
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27 | <ul> |
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28 | <li><a href="index.html#overview">Overview</a></li> |
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29 | <li><a href="index.html#status">Status</a></li> |
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30 | <li><a href="index.html#download">Download</a></li> |
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31 | <li><a href="index.html#history">History</a></li> |
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32 | <li><a href="index.html#references">References</a></li> |
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33 | <li><a href="index.html#credits">Credits</a></li> |
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34 | <li><a href="index.html#contact">Contact</a></li> |
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35 | </ul> |
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36 | </li> |
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37 | <li><a href="manual.html">Manual</a> |
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38 | <ul> |
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39 | <li><a href="manual.html#introduction">Introduction</a></li> |
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40 | <li><a href="manual.html#installation">Installation</a></li> |
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41 | <li><a href="manual.html#parser">Parser Objects</a></li> |
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42 | </ul> |
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43 | </li> |
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44 | <li><strong>Examples</strong></li> |
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45 | <li><a href="lom.html">Lua Object Model</a></li> |
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46 | <li><a href="http://luaforge.net/projects/luaexpat/">Project</a> |
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47 | <ul> |
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48 | <li><a href="http://luaforge.net/tracker/?group_id=13">Bug Tracker</a></li> |
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49 | <li><a href="http://luaforge.net/scm/?group_id=13">CVS</a></li> |
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50 | </ul> |
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51 | </li> |
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52 | <li><a href="license.html">License</a></li> |
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53 | </ul> |
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54 | </div> <!-- id="navigation" --> |
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55 | |
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56 | <div id="content"> |
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57 | |
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58 | <h2><a name="examples"></a>Examples</h2> |
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59 | |
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60 | <p>The code excerpt below creates a parser with 2 callbacks and |
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61 | feeds a test string to it. The parsing of the test string triggers |
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62 | the callbacks, printing the results.</p> |
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63 | |
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64 | <pre class="example"> |
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65 | require"lxp" |
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66 | |
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67 | local count = 0 |
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68 | callbacks = { |
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69 | StartElement = function (parser, name) |
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70 | io.write("+ ", string.rep(" ", count), name, "\n") |
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71 | count = count + 1 |
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72 | end, |
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73 | EndElement = function (parser, name) |
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74 | count = count - 1 |
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75 | io.write("- ", string.rep(" ", count), name, "\n") |
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76 | end |
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77 | } |
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78 | |
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79 | p = lxp.new(callbacks) |
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80 | |
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81 | for l in io.lines() do -- iterate lines |
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82 | p:parse(l) -- parses the line |
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83 | p:parse("\n") -- parses the end of line |
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84 | end |
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85 | p:parse() -- finishes the document |
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86 | p:close() -- closes the parser |
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87 | </pre> |
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88 | |
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89 | <p>For a test string like</p> |
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90 | |
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91 | <pre class="example"> |
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92 | <elem1> |
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93 | text |
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94 | <elem2/> |
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95 | more text |
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96 | </elem1> |
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97 | </pre> |
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98 | |
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99 | <p>The example would print</p> |
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100 | |
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101 | <pre class="example"> |
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102 | + elem1 |
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103 | + elem2 |
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104 | - elem2 |
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105 | - elem1 |
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106 | </pre> |
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107 | |
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108 | <p>Note that the text parts are not handled since the corresponding |
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109 | callback (<em>CharacterData</em>) has not been defined. Also note |
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110 | that defining this callback after the call to lxp.new would make no |
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111 | difference. But had the callback table been defined as</p> |
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112 | |
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113 | <pre class="example"> |
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114 | callbacks = { |
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115 | StartElement = function (parser, name) |
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116 | io.write("+ ", string.rep(" ", count), name, "\n") |
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117 | count = count + 1 |
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118 | end, |
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119 | EndElement = function (parser, name) |
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120 | count = count - 1 |
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121 | io.write("- ", string.rep(" ", count), name, "\n") |
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122 | end, |
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123 | CharacterData = function (parser, string) |
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124 | io.write("* ", string.rep(" ", count), string, "\n") |
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125 | end |
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126 | } |
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127 | </pre> |
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128 | |
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129 | <p>The results would have been</p> |
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130 | |
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131 | <pre class="example"> |
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132 | + elem1 |
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133 | * text |
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134 | + elem2 |
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135 | - elem2 |
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136 | * more text |
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137 | - elem1 |
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138 | </pre> |
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139 | |
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140 | <p>Another example would be the use of <em>false</em> as a |
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141 | placeholder for the callback. Suppose that we would like to print |
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142 | only the text associated with <em>elem2</em> elements and that the |
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143 | XML sample is</p> |
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144 | |
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145 | <pre class="example"> |
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146 | <elem1> |
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147 | text |
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148 | <elem2> |
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149 | inside text |
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150 | </elem2> |
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151 | more text |
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152 | </elem1> |
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153 | </pre> |
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154 | |
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155 | <p>We could define the new callback table as</p> |
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156 | |
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157 | <pre class="example"> |
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158 | callbacks = { |
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159 | StartElement = function (parser, name) |
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160 | if name == "elem2" then |
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161 | -- redefines CharacterData behaviour |
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162 | callbacks.CharacterData = function (parser, string) |
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163 | io.write(string, "\n") |
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164 | end |
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165 | end |
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166 | end, |
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167 | |
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168 | EndElement = function (parser, name) |
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169 | if name == "elem2" then |
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170 | callbacks.CharacterData = false -- restores placeholder |
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171 | end |
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172 | end, |
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173 | |
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174 | CharacterData = false -- placeholder |
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175 | } |
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176 | </pre> |
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177 | |
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178 | <p>The results would have been</p> |
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179 | |
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180 | <pre class="example"> |
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181 | inside text |
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182 | </pre> |
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183 | |
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184 | <p>Note that this example assumes no other elements are present |
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185 | inside elem2 tags.</p> |
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186 | |
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187 | </div> <!-- id="content" --> |
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188 | |
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189 | </div> <!-- id="main" --> |
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190 | |
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191 | <div id="about"> |
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192 | <p><a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-xhtml10" alt="Valid XHTML 1.0!" height="31" width="88" /></a></p> |
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193 | <p><small> |
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194 | $Id: examples.html,v 1.5 2006/03/23 00:19:37 carregal Exp $ |
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195 | </small></p> |
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196 | </div> <!-- id="about" --> |
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197 | |
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198 | </div> <!-- id="container" --> |
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199 | |
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200 | </body> |
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201 | </html> |