[Xapian-discuss] query expansion terms

Olly Betts olly at survex.com
Sat Apr 1 00:27:02 BST 2006

On Fri, Mar 31, 2006 at 12:31:54AM +0530, durga bidaye wrote:
> 1. I wud like to know what exactly happens during query expansion,that is,
> how are the relevent documents used while coming up with expansion terms.
> Some explanation that is less mathematical than the one given in
> "Introduction to IR" wud be preferred.

Sorry, that's the only explanation we currently have to offer.  You
could try searching in google for an alternative description - what we
implement is a standard part of probabilistic information retrieval.

> 2. The syntax fr xapian bindings-php given in bindings.html seems to be
> insufficient..Is there any way by which i can find out what is the
> corresponding function in php for a given function in c++?

The section "Object orientation" of bindings.html for PHP tells you
*exactly* how to find the PHP name of the wrapper for a given C++

> I went thru xapian_wrap.cc. I think thats where the wrapping has been
> done and hence thats where i can find the syntax fr xapian
> bindings-php.Am I right?

That file is automatically generated by SWIG, so it's pretty hard to
understand.  I'd not recommend it as a source of reference.

> 3. What is the syntax for wildcard(*) search in xapian bindings-php?

You need to pass QueryParser_FLAG_WILDCARD in the flags bitmap argument
to QueryParser_parse_query, much as you would in C++.


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