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From "Villemos, Gert" <>
Subject AW: AW: Concept Expansion
Date Sat, 05 Sep 2009 21:26:21 GMT
Thanks for the answer. Documentation on QParserPlugins concepts seems to be limited (well,
at least my search didnt find it and the java doc doesnt provide much of an explanation).
Do I understand the concepts / your suggestion correctly;
- The QParserPlugin is a factory for the actual QParser parser, i.e. based on the query string
and other parameters a parser is instantiated and setup.
- As part of the construction the plugin parses the q string and extracts the parameters,
ading them as TermQuery(s) to the parser.
- A 'concept expansion' extension could simply be a QParserPlugin specialization, which as
part of the 'createParser' method expands the terms in the q string, i.e. 'replace' the input
'q=software' with 'q=software OR program OR computer OR system OR package'.


Von: Paul Libbrecht []
Gesendet: Sa 05.09.2009 23:03
Betreff: Re: AW: Concept Expansion


we're doing a similar process on i2geo search, including simple 
language expansion (one word is queried in several fields of each 
language), and, though I haven't made it yet but will soon, I've been 
suggested to do it as qparser plugin.


Le 05-sept.-09 à 22:47, Villemos, Gert a écrit :

> [Sorry, post submitted as HTML. Proper format below;]
> We would like to support concept expansion in searches, i.e. when a 
> user searches for 'software' then the system should also search for 
> keywords / phrases such as program, computer , system, package and 
> class.
> I imagine that the right way of doing this is a request handler, 
> which expands a query into its conceptual similar entries and 
> aggregates the results. A simple change in the filter from;
> q:software => 
> would most likely do the job.
> Does such a request handler already exist (... looking at the list 
> on the wiki and in the javadocs the answer seems to be no, but maybe 
> its maintained externally)?
> And is this the right way to go at all?
> Thanks,
> Gert.

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