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Today's Topics:

  1. Antwort: Re:  Help indexing phrases (martin.braendle@uzh.ch)


----------------------------------------------------------------------

Message: 1
Date: Mon, 25 Jan 2021 12:49:00 +0100
From: <martin.braendle@uzh.ch>
Subject: [EP-tech] Antwort: Re:  Help indexing phrases
To: <eprints-tech@ecs.soton.ac.uk>, David R Newman
   <drn@ecs.soton.ac.uk>
Message-ID:
   <OF0D573B1B.0648AFE6-ONC1258668.0040E951-C1258668.0040E953@lotus.uzh.ch>
   
Content-Type: text/plain; charset="utf-8"

CAUTION: This e-mail originated outside the University of Southampton.
Hi Phil,

in the final end, reverse indexes of standard search engines are single term based. This is a basic principle.

Xapian is pretty basic in this matter - more advanced search engines such as ElasticSearch offer field types such as "keyword" that allow to store multi-term _expression_ - in the end however, the Lucene backend also will store single terms in its reverse indexes.

Still, there is the difficulty how to identify a multi-term _expression_ within a bulk of text - this is usually the field of Natural Language Processing, and special tools and thesauri are needed.

Kind regards,

Martin


-----<eprints-tech-bounces@ecs.soton.ac.uk<mailto:eprints-tech-bounces@ecs.soton.ac.uk>> schrieb: -----
An: <eprints-tech@ecs.soton.ac.uk<mailto:eprints-tech@ecs.soton.ac.uk>>, "Phil Stacey" <phil@buildvoc.co.uk<mailto:phil@buildvoc.co.uk>>
Von: "David R Newman via Eprints-tech"
Gesendet von:
Datum: 25.01.2021 10:39
Betreff: Re: [EP-tech] Help indexing phrases


Hi Phil,

Unfortunately, I don't think this is possible.  I think you would need to create a new field that is an id multiple field and use this.  You could probably write a script to map from the uncontrolled keywords field into this new multiple id field.  However, even with this new field I am not sure how well Xapian would index these as individual multi-word terms.  Advanced search for this field should work as you require.  In 3.4.2 I introduced the Idci MetaField that is basically the same as the Id MetaField but that matches case-insensitively, this is useful for mathcing things like email addresses and usernames, where case does not usually make a functional difference.

I have been thinking how best to implement a keywords fields that is more effective across simple, advanced and faceted search, particularly for multi-word terms.  I have yet to conclude on a solution, as I need to better understand how Xapian indexing works to see if it can be setup to allow EPrints to effectively index multiple-word terms.

Regards

David Newman

On 25/01/2021 07:06, Phil Stacey via Eprints-tech wrote:
CAUTION: This e-mail originated outside the University of Southampton.
Using uncontrolled keywords field which has phrases separated by commas, like to index the whole phrase.

For example :-
evacuation lift, part b - fire safety, b5 access and facilities for the fire
service, fire risk assessment, residual risk, building safety, b4 external
fire spread, means of escape, principal works, health & safety strategy
https://eur03.safelinks.protection.outlook.com/?url="">

Question how do I configure xapian or indexing.pl to index the whole phrase instead of the individual terms for example fire, safety, or building

Best Regards,
Phil Stacey
building regulations guidance for fire safety<https://eur03.safelinks.protection.outlook.com/?url="">


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