blending.cfg

Introduction

Name

blending.cfg

Profile specific location

~/conf/<collection>/<profile>/

Collection level location

~/conf/<collection>/

Description

List of queries to apply to blend together into a single result set based on triggers.

Background

Query blending allows multiple variants of a query to be run and then blended into a single result set. Query blending can be performed based on a number of sources as defined in the -qsup query processor option. This file defines the blending rules to be applied.

Usage

blending.cfg should only be used in tandem with the -qsup=SYNS query processor option - entries in blending.cfg may be different from those in synonyms.cfg.

Format

A text file, beginning with a line indicating the version number of the thesaurus (currently there is only one available). Each subsequent line indicates an entire query or query term that will be expanded into a different query or query term, with the resulting query being blended with the initial one. Each line is then:

(type)=(query/term)=(expansion)

where type is a character indicating the type of expansion:

- indicates a whole of query expansions
% indicates a term by term expansion
~ indicates a regular expression expansion

Profiles

When a profile is set, the blending.cfg for that profile will be used. If the set profile does not have a profile specific blending.cfg file the collection level file will be used instead.

Example

PADRE Thesaurus Version: 2
%=colour=color
+=Department for Administrative Affairs=DAA
~=w.*the.*=green

The above settings would result in the following processing:

The query colour returning combined results for colour and for color
The query Department for Administrative Affairs returning combined results for Department for Administrative Affairs and DAA
The query where are the documents returning combined results for where are the documents and green