Hi,
My question is about trying to get back search results that favour the lowest
edit-distance between a search phrase and the content of an element.
I'm dealing with a large set of legislation, and many items within this set
have very similar titles. For example, there are three items named:
* National Health Service (Optical Charges and Payments) and (General
Ophthalmic Services) (Amendment) (Wales) Regulations 2001
* National Health Service (Optical Charges and Payments) and (General
Ophthalmic Services) (Amendment) (No.2) (Wales) Regulations 2001
* The National Health Service (Optical Charges and Payments) and (General
Ophthalmic Services) (Amendment) (No.3) (Wales) Regulations 2001
In general, I want to do a keyword search on these titles, so that a search for
"National Health Service" will bring back all three of the above; in this case
I don't particularly care about the order as they're all likely to be of
relevance.
However, if I search for a full title, I want to make sure that the first
result is the one that matches that title best. That's easy if the title
exactly matches (or exactly matches with stemming variants): I have:
cts:or-query((
cts:element-value-query(xs:QName('dc:title'), $title, (), 10),
... more complex keyword-based search with lower weight ...
))
but I'm running into problems in the case where the match isn't a precise one.
A search for:
"National Health Service (Optical Charges & Payments) and (General Ophthalmic
Services) (Amendment) (Wales) Regulations 2001"
doesn't match any of the titles exactly because it's got a '&' rather than a
'and', but it should still match (I exclude stop-words from the search) and
bring back the first in the above as the highest priority, because it's the
closest match to the string -- it doesn't contain an additional "(No. 2)" or
"The".
So my question is how can I achieve this? Is there any way of ordering based on
edit distance? Or of including a negative-weighted query that would mean a
lower score to elements that contain additional terms?
Any ideas appreciated,
Jeni
--
Jeni Tennison
http://www.jenitennison.com
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