Searches interspersed with a minus (separated by spaces) will exclude the
following term. (AND NOT)
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Key: DS-1121
URL: https://jira.duraspace.org/browse/DS-1121
Project: DSpace
Issue Type: Bug
Components: DSpace API
Affects Versions: 1.8.1, 1.8.0
Reporter: Peter Dietz
Assignee: Peter Dietz
Fix For: post-1.8.x
Attachments: Screen Shot 2012-02-08 at 4.30.51 PM.png, Screen Shot
2012-02-08 at 4.31.03 PM.png
I have confirmed that this problem exists... Here's the original report.
-- In an email to dspace-tech, Jessica Lindholm writes:
Dear all,
I would like some advice on Boolean operators and their implications on search
/ search results.
Some publications have a minus sign in titles, e.g. in Chronic intraoral pain -
assessment of diagnostic methods and prognosis http://hdl.handle.net/2043/12563.
This gives us a problem when searching for the item. It coincides with '-'
minus being the operator for AND NOT, so we all of a sudden look for stuff
without specific words. A simple free-text search matching the title above
leads to zero hits. And users tend to e.g. copy a title from a reference list
to the search box.
Has anyone encountered the same problem? We have looked around and haven't
found a solution (stopwords, tokens, queries).
We are using AND as standard operator for all searches, i.e. we have that
changed in config.xml (from default OR). If we had used OR as default the
problem wouldn't appear, and possibly this opens up for a logical slip in the
system (or by me, which is not unlikely at all). Google uses the same operator,
but handling it differently when surrounded by whitespaces.
Is this a possible bug encountered?
We would preferably like to change the Boolean operators to usage of
capitalised AND NOT, AND etc instead of -,+. Believing this would solve the
issue. Is this possible (Java okay)?
However when matching exact, using quotation marks both the searches: "Chronic
intraoral pain assessment of diagnostic methods and prognosis" (minus excluded)
and "Chronic intraoral pain - assessment of diagnostic methods and prognosis"
works fine. So the minus is treated to some extent.
Looking forward to understand better,
Jessica Lindholm
Ps Malmo university is using DSpace (1.8.*) XMLUI as our institutional
repository.
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