in javadoc http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Similarity.html#formula_norm norm(t,d) = doc.getBoost() ・ lengthNorm(field) ・ ∏ f.getBoost() field f in d named as t whre is field come from in lengthNorm(field)? In my option, term t may appear in a doc d many times with different fields. So ∏ f.getBoost() field f in d named as t makes sense. But Why there is only one lengthNorm(field) ? does it mean that norm(t,d)=norm(t.text, t.field, d)? That's is-- every doc,every field,every term , there is a norm value ?
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