Xapian discuss - Jan 2011 - document weights

Is there a mechanism or technique to allow me to boost document relevancy,
independent of search terms?

I do not necessarily want to do any of the sorts described here:
http://xapian.org/docs/sorting.html#sorting-by-value. Rather I'd like to
sort by something like relevancy*boost factor, like:
http://lucene.apache.org/java/2_3_2/api/org/apache/lucene/document/Document.html#setBoost(float)


Thanks,
Wes

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