rdoc/Porter2.html

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 107                 <h1 class="module">Porter2</h1>
 108
 109                 <div id="description">
 110                         <p>
 111 Constants for the Porter 2 stemmer
 112 </p>
 113
 114                 </div>
 115
 116                 <!-- Constants -->
 117
 118                 <div id="constants-list" class="section">
 119                         <h3 class="section-header">Constants</h3>
 120                         <dl>
 121
 122                                 <dt><a name="C">C</a></dt>
 123
 124                                 <dd class="description"><p>
 125 A non-vowel
 126 </p></dd>
 127
 128
 129                                 <dt><a name="V">V</a></dt>
 130
 131                                 <dd class="description"><p>
 132 A vowel: a e i o u y
 133 </p></dd>
 134
 135
 136                                 <dt><a name="CW">CW</a></dt>
 137
 138                                 <dd class="description"><p>
 139 A non-vowel other than w, x, or Y
 140 </p></dd>
 141
 142
 143                                 <dt><a name="Double">Double</a></dt>
 144
 145                                 <dd class="description"><p>
 146 Doubles created when adding a suffix: these are undoubled when stemmed
 147 </p></dd>
 148
 149
 150                                 <dt><a name="Valid_LI">Valid_LI</a></dt>
 151
 152                                 <dd class="description"><p>
 153 A valid letter that can come before &#8216;li&#8217; (or &#8216;ly&#8217;)
 154 </p></dd>
 155
 156
 157                                 <dt><a name="SHORT_SYLLABLE">SHORT_SYLLABLE</a></dt>
 158
 159                                 <dd class="description"><p>
 160 A specification for a short syllable.
 161 </p>
 162 <p>
 163 A short syllable in a word is either:
 164 </p>
 165 <ol>
 166 <li><p>
 167 a vowel followed by a non-vowel other than w, x or Y and preceded by a
 168 non-vowel, or
 169 </p>
 170 </li>
 171 <li><p>
 172 a vowel at the beginning of the word followed by a non-vowel.
 173 </p>
 174 </li>
 175 </ol>
 176 <p>
 177 (The original document is silent on whether sequences of two or more
 178 non-vowels make a
 syllable long. But as this specification is only used to
 179 find sequences of non-vowel -
 vowel - non-vowel - end-of-word, this
 180 ambiguity does not have an effect.)
 181 </p></dd>
 182
 183
 184                                 <dt><a name="STEP_2_MAPS">STEP_2_MAPS</a></dt>
 185
 186                                 <dd class="description"><p>
 187 Suffix transformations used in porter2_step2.
 (ogi, li endings dealt with
 188 in procedure)
 189 </p></dd>
 190
 191
 192                                 <dt><a name="STEP_3_MAPS">STEP_3_MAPS</a></dt>
 193
 194                                 <dd class="description"><p>
 195 Suffix transformations used in porter2_step3.
 (ative ending dealt with in
 196 procedure)
 197 </p></dd>
 198
 199
 200                                 <dt><a name="STEP_4_MAPS">STEP_4_MAPS</a></dt>
 201
 202                                 <dd class="description"><p>
 203 Suffix transformations used in porter2_step4.
 (ion ending dealt with in
 204 procedure)
 205 </p></dd>
 206
 207
 208                                 <dt><a name="SPECIAL_CASES">SPECIAL_CASES</a></dt>
 209
 210                                 <dd class="description"><p>
 211 Special-case stemmings
 212 </p></dd>
 213
 214
 215                                 <dt><a name="STEP_1A_SPECIAL_CASES">STEP_1A_SPECIAL_CASES</a></dt>
 216
 217                                 <dd class="description"><p>
 218 Special case words to stop processing after step 1a.
 219 </p></dd>
 220
 221
 222                         </dl>
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