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-<html>
-<head></head>
-<body>
-The calculus of spans.
-
-<p>A span is a <code><doc,startPosition,endPosition></code> tuple.</p>
-
-<p>The following span query operators are implemented:
-
-<ul>
-
-<li>A <a href="SpanTermQuery.html">SpanTermQuery</a> matches all spans
-containing a particular <a href="../../index/Term.html">Term</a>.</li>
-
-<li> A <a href="SpanNearQuery.html">SpanNearQuery</a> matches spans
-which occur near one another, and can be used to implement things like
-phrase search (when constructed from <a
-href="SpanTermQuery.html">SpanTermQueries</a>) and inter-phrase
-proximity (when constructed from other <a
-href="SpanNearQuery.html">SpanNearQueries</a>).</li>
-
-<li>A <a href="SpanOrQuery.html">SpanOrQuery</a> merges spans from a
-number of other <a href="SpanQuery.html">SpanQueries</a>.</li>
-
-<li>A <a href="SpanNotQuery.html">SpanNotQuery</a> removes spans
-matching one <a href="SpanQuery.html">SpanQuery</a> which overlap
-another. This can be used, e.g., to implement within-paragraph
-search.</li>
-
-<li>A <a href="SpanFirstQuery.html">SpanFirstQuery</a> matches spans
-matching <code>q</code> whose end position is less than
-<code>n</code>. This can be used to constrain matches to the first
-part of the document.</li>
-
-</ul>
-
-In all cases, output spans are minimally inclusive. In other words, a
-span formed by matching a span in x and y starts at the lesser of the
-two starts and ends at the greater of the two ends.
-</p>
-
-<p>For example, a span query which matches "John Kerry" within ten
-words of "George Bush" within the first 100 words of the document
-could be constructed with:
-<pre class="prettyprint">
-SpanQuery john = new SpanTermQuery(new Term("content", "john"));
-SpanQuery kerry = new SpanTermQuery(new Term("content", "kerry"));
-SpanQuery george = new SpanTermQuery(new Term("content", "george"));
-SpanQuery bush = new SpanTermQuery(new Term("content", "bush"));
-
-SpanQuery johnKerry =
- new SpanNearQuery(new SpanQuery[] {john, kerry}, 0, true);
-
-SpanQuery georgeBush =
- new SpanNearQuery(new SpanQuery[] {george, bush}, 0, true);
-
-SpanQuery johnKerryNearGeorgeBush =
- new SpanNearQuery(new SpanQuery[] {johnKerry, georgeBush}, 10, false);
-
-SpanQuery johnKerryNearGeorgeBushAtStart =
- new SpanFirstQuery(johnKerryNearGeorgeBush, 100);
-</pre>
-
-<p>Span queries may be freely intermixed with other Lucene queries.
-So, for example, the above query can be restricted to documents which
-also use the word "iraq" with:
-
-<pre class="prettyprint">
-Query query = new BooleanQuery();
-query.add(johnKerryNearGeorgeBushAtStart, true, false);
-query.add(new TermQuery("content", "iraq"), true, false);
-</pre>
-
-</body>
-</html>
fnp / pylucene.git / blobdiff