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ZNG  December 2004

ZNG December 2004

Subject:

diagnosing unsupported features

From:

Eric Lease Morgan <[log in to unmask]>

Reply-To:

Z39.50 Next-Generation Initiative

Date:

Wed, 22 Dec 2004 15:11:28 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (59 lines)

What is the expected procedure for diagnosing and documenting
unsupported SRU server features?

As I have alluded to previously, Ed S. has written two object oriented
Perl modules implementing much (if not all) of SRU and CQL. See:

   http://search.cpan.org/dist/SRU/
   http://search.cpan.org/dist/CQL-Parser/

Using these modules I have gone a long way in implementing an SRU
server:

   http://alert.ockham.org/sru-server.cgi

My next steps are to:

   1. create a more robust ZeeRex record for my
      explain operation documenting what features
      my server supports

   2. trap unsupported features that are requested
      anyway and return the appropriate diagnostic

For better or for worse, my underlying search engine is swish-e:

   http://www.swish-e.org/

(Incidentally, my particular implementation does not hard code the use
of swish-e. The interface to swish-e is supported through a toSwish
method, and other indexers/search engines could be supported by writing
things like a toPlucene or toYourFavoriteIndexer modules.)

Swish-e supports much of what I desire:

   * simple single-term searches
   * multi-word searches implemented as Boolean and
   * phrase searches
   * Boolean logic
   * nesting
   * field (index) searching
   * sorting
   * a C, Perl, and a PHP API

Unfortunately, the swish-e search interface does not support much of
CQL. For example, it does not support:

   * exact match (exact)
   * proximity searches (prox)
   * relations other than equals (<, >, <>, etc.)
   * robust pattern matching except right-hand truncation

Consequently, I will document these features (or lack thereof) in the
ZeeRex record of my explain response, but what do I do when my server
gets queries like exact or prox anyway? I suppose I will have to trap
for these kind of queries and return appropriate diagnostics. No?

--
Eric Morgan

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