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ZNG  June 2004

ZNG June 2004

Subject:

Re: Relevance Ranking Context Set

From:

Mike Taylor <[log in to unmask]>

Reply-To:

Z39.50 Next-Generation Initiative

Date:

Thu, 3 Jun 2004 20:15:25 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (60 lines)

> Date: Thu, 3 Jun 2004 18:52:54 +0100
> From: Robert Sanderson <[log in to unmask]>
>
> First draft is available at:
>    http://srw.cheshire3.org/contextSets/rel/
>
> Comments, as always, are sought :)

Hi, Rob.  I don't know much about relevance so I'll just pick on the
document itself.  Hope this is useful.

> The default ordering of a result set is left up to the server,
> including no ordering what-so-ever.

"whatsoever" is all one word.

> However, for sophisticated relevance based ranking, this needs to be
> part of the query itself so that boolean operands might be treated
> differently, and how the sub-results of each operand are combined.

I can't parse the last clause.

> If you wish to have an algorithm added [...]

"... to this set ..."

> If the 'relevant' relation modifier from the cql context set is
> given, but no named algorithm, then the server should continue to
> use the basic semantics -- the server may decide which algorithm to
> use.

Isn't that a contradiction?

> Also, please note that all aspects of context sets are case
> insensitive. "rel.CORI" and "rel.cori" are to be treated the
> same.

Is this generally true of CQL indexes and modifiers?

> info:srw/cql-context-set/2/relevancy-1.0

Why "relevancY" instead of "relevancE"?

> const_*       A named constant relevant to the algorithm, eg const_k=0.7

I think you need to say more about this.

What about TF-IDF?

You should probably explicitly say that the set defines no indexes.

 _/|_    _______________________________________________________________
/o ) \/  Mike Taylor  <[log in to unmask]>  http://www.miketaylor.org.uk
)_v__/\  Cab driver to Groucho Marx: "Have a nice day"; Marx: "I'll
         have the hell sort of day I want"

--
Listen to free demos of soundtrack music for film, TV and radio
        http://www.pipedreaming.org.uk/soundtrack/

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