[Koha-zebra] firstinfield and position attributes usage

[Sebastian Hammer]

Henri-Damien LAURENT wrote:

>Hi,
>I have problems using firstinfield and position attributes and then
>querying with @attr 3=1.
>Indeed, some users would find it cool to search anatomy only with the
>beginning of the phrase.
>
>
>First of all, I wonder how I can define a custom index and use it.
>It seems that using completeness attribute implies @attr 6=1 if 0 @attr
>6=2 or @attr 6=1.
>position is not defined in you documentation.
>firstinfield seems to be used along with it.
>  
>
Hi Henri,

Zebra at present does not support the first-in-field attribute, although 
we sometimes have talked about doing so. You can simulate it pretty well 
by using a combination of complete subfield and truncation. You'll note 
there's also a way to configure an index to ignore leading articles 
(the, an, a, etc.), which is a good way to increase your recall.. yes, 
it's hard to make this word with word boundaries, (Adam might have a 
suggestion for some regexp magic that would work), but I think that's 
probably a minor problem in most cases.

--Sebastian

>I tried to define :
>
>index h
>completeness 0
>position 1
>firstinfield 1
>charmap sort-string-utf.chr
>
>in default.idx and
>used it in record.abs :
>melm 250$a Heading, Heading:h, Heading:s
>
>and queried my base as such :
>f @and @attr "1=Authority/format-id" @attr 5=100 MSC  @attr "1=Heading"
>@attr 3=1 An
>
>Answer was :
>ERROR 119
>
>Is there something I missed ?
>
>  
>

-- 
Sebastian Hammer, Index Data
quinn at indexdata.com   www.indexdata.com
Ph: (603) 209-6853 Fax: (866) 383-4485