algorithms--weighting functions-methods

Hi,


 firstly,      When you say change the algorithm, you mean that change the
weighting function , right?
        I think there are 3 place to be changed when some one want to apply
a new algorithm, they are:

            1, double CWeightingFunction::subApply(const double
inDocumentFrequency,
                    const double inNormalizingFactor)

             2, void CScoreBoard::operator()(const CWeightingFunction& inWF,

                 const CDocumentFrequencyElement& inDFE)

             3, double CWeightingFunction::getTermFrequency()



     Am I right?


 Secondly , in gift-config.mrml, there are algorithm such as "Separate
Normalisation" ,"Perl link" . But I cant find the code for these
algorithms,  Did Viper implement them?


Thirdly, what is the relationship between algorithm and weighting function
?  And what's the difference? In mrml tag <algorithm>, there are information
for both of them.

The last, what tag in mrml   does the Server use to determine which query
engine to use ? Can one algorithm be used by two query engine?

Thank you very much.

Cheers,

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