blending.cfg is used to define the set of synonyms that apply when query blending is enabled.


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.


blending.cfg can be created from the configuration file manager for a results page or search package. If defined for a search package all child results page will inherit the blending list. If defined at the results page this will be used in preference to a blending.cfg defined for the search package.

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


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:


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


PADRE Thesaurus Version: 2 (1)
%=color=colour (2)
+=Department for Administrative Affairs=DAA (3)
~=w.*the.*=green (4)
1 This header line must be the first line of the blending.cfg file
2 Any occurrences of colour in a query will also be queried with color
3 The exact query Department for Administrative Affairs will also be blended with results for the query DAA
4 The query where are the documents will be blended with results for where are the documents and green