There have been a couple of alternative Highlighter contributions recently, I can't recall which claim to support "proper" highlighting of phrases but you might want to give them a try.
http://issues.apache.org/jira/browse/LUCENE-644 http://issues.apache.org/jira/browse/LUCENE-663 Ultimately "proper" highlighting is very hard to achieve if you both want to select a summary of the doc's "best bits" and also support queries which can be arbitrarily complex nestings of boolean queries which can also contain Spans/phrases covering large sections of the document. Some compromises are inevitable under these extreme circumstances and I don't think there is one implementation that is capable of catering for this. Let us know how you get on. Cheers Mark ----- Original Message ---- From: Heikki Doeleman <[EMAIL PROTECTED]> To: java-user@lucene.apache.org Sent: Friday, 10 November, 2006 2:45:23 PM Subject: Highlighting span for Phrase Queries Hi there, I have a question on using the Highlighter. I'm using Lucene in a web application that allows you to search the catalogue of a library. The idea is to highlight, in the results, the terms entered by the user. I'm using a Highlighter with a NullFragmenter because I want the whole field highlighted (for each field the user searched in). The catalogue is indexed with a StandardAnalyzer on each field. Highlighting a field from a result I do like this : QueryScorer scorer = new QueryScorer ( theQuery, searcher.getIndexReader ( ) , fieldName ) ; Highlighter highlighter = new Highlighter ( new SimpleHTMLFormatter ( "<span style=\"border-style:solid;\">" , "</span>" ) , scorer ) ; highlighter. setTextFragmenter ( new NullFragmenter ( ) ) ; highlightedFieldContent = highlighter. getBestFragment ( analyzer , fieldName , originalFieldContent ) ; This works all very well, except for phrase queries. The spans of the phrase queries as such are not highlighted and instead, each of the terms that is in the phrase query, gets highlighted. I guess this is because the indexed fields have been tokenized, and what-not, by the StandardAnalyzer. Does anyone have a good example about how to implement a highlighting function that works well with phrase queries, too ? thank you very much. Heikki DOELEMAN ___________________________________________________________ Now you can scan emails quickly with a reading pane. Get the new Yahoo! Mail. http://uk.docs.yahoo.com/nowyoucan.html --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
