AVS search in update D

[Kim Crowley <crowley@xxxxxxxxxx>]

III has loaded a patch on our system to "fix" advanced keyword 
searching.  There is now a new wwwoption that lets you choose how far you 
would like to go to make the system avoid returning a search that garners 
no hits.  I'm pasting in the "documentation" we received with the patch.  
It works very nicely!  I think you will have to have them load a patch 
before you can use the new wwwoption.  We have chosen ASSEARCH=1 and if 
you would like to see it in action you can go to:
http://dalva.fcgov.com

kc
=========================
ASSEARCH (Update D & Later)

  When searching an Advanced Search index (e.g., 'X', 'Y', or 'Z'), if
  the search does not return any results, the Web OPAC begins a series
  of target modifications in an attempt to return any potentially
  useful results. For example, if one entered the following search:

                     a:xnqrt t:zwnmk

  and no records matched, Web OPAC would modify the target, retrying
  each modification, and report as follows (the numbers in square
  brackets do not appear in Web OPAC's output):

          Your search query has been changed...
          Tried: (a:xnqrt t:zwnmk) no records found          [0]
          Tried: (a:xnqrt and t:zwnmk) no records found      [1]
          Tried: (a:xnqrt or t:zwnmk) no records found       [2]
          Tried: (xnqrt or zwnmk) no records found           [3]
          Tried: xn** no records found                       [4]
          Tried: xa** 77 records found                       [5]

The modifications applied in each level are:

	  0      No modification (search tried "as is" in adjacency mode)
          1      Change from an adjacency search to an "AND" search
          2      Change from an adjacency search to an "OR" search
          3      Do an "OR" search, discarding any field limits
          4      Search on only the first word, discard any field limits,
                 and truncate the first two characters
          5      Search on only the first word, discard any field limits,
                 truncate the first two characters, and change the second
                 character to the letter 'a'

  The ASSEARCH option specifies the highest level of modification applied
  to a failed search. For example, if ASSEARCH=3, then only the first
  three modifications are applied to a failed search, skipping truncation
  steps 4 and 5.  If ASSEARCH=0, then no target modification is applied
  to failed seaches.
  By default, if this option does not appear in the WWWOPTIONS file, the Web
  OPAC behaves as if it were set to '0' (no target string modification).

  NOTE: The ASSEARCH option replaces the
        ASTRUNCATE option, which is now
        obsolete.
======================================================================

Kim Crowley, Technology Coordinator 
Fort Collins Public Library
201 Peterson Street			phone: 970-221-6662
Fort Collins, CO  80524			fax:   970-221-6398
crowley@xxxxxxxxxx



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