There's a post over at SearchEngineWatch theorizing about how Google produces summaries.

http://forums.searchenginewatch.com/showthread.php?threadid=5448

Lucene's current highlighter doesn't easily support multi-fields, nor does it take phrasal matching into account. It might be useful to have a highligher API that takes a Document and summarizes all of its fields, incorporating their boosts in fragment scores. Thoughts?

Doug


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