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20 using Attribute = Mono.Lucene.Net.Util.Attribute;
22 namespace Mono.Lucene.Net.Analysis.Tokenattributes
25 /// <summary>The positionIncrement determines the position of this token
26 /// relative to the previous Token in a TokenStream, used in phrase
29 /// <p/>The default value is one.
31 /// <p/>Some common uses for this are:<ul>
33 /// <li>Set it to zero to put multiple terms in the same position. This is
34 /// useful if, e.g., a word has multiple stems. Searches for phrases
35 /// including either stem will match. In this case, all but the first stem's
36 /// increment should be set to zero: the increment of the first instance
37 /// should be one. Repeating a token with an increment of zero can also be
38 /// used to boost the scores of matches on that token.</li>
40 /// <li>Set it to values greater than one to inhibit exact phrase matches.
41 /// If, for example, one does not want phrases to match across removed stop
42 /// words, then one could build a stop word filter that removes stop words and
43 /// also sets the increment to the number of stop words removed before each
44 /// non-stop word. Then exact phrase queries will only match when the terms
45 /// occur with no intervening stop words.</li>
50 /// <seealso cref="Mono.Lucene.Net.Index.TermPositions">
52 public interface PositionIncrementAttribute:Attribute
54 /// <summary>Set the position increment. The default value is one.
57 /// <param name="positionIncrement">the distance from the prior term
59 void SetPositionIncrement(int positionIncrement);
61 /// <summary>Returns the position increment of this Token.</summary>
62 /// <seealso cref="setPositionIncrement">
64 int GetPositionIncrement();