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Subject: RE: [search-ws] proximity exclusion flag
Prox has always been a modifier on a Boolean in my
systems. It is simply AND with extra qualifiers. So, “fish
adj chips” is a subset of “fish and chips”. I’d
represent it as something like “fish and/proxUnit=word,distance=1 chips”.
Your problem case becomes “fish and/proxUnit=word,distance!=1 chip”. It is absolutely NOT the case that “fish not/prox chips”
is a subset of “fish NOT chips”. So, the not/prox should NOT
be a modifier on the NOT Boolean. Ralph From: Ray Denenberg,
Library of Congress [mailto:rden@loc.gov] I've run
across a problem with our proximity "proposal" in the message I
posted last week, specifically: ---------------------------------------------------------------- The problem
is, I don't see how you can add proximity modifiers: if you put a slash after
prox above, how do you know whether the modifier following the slash is a
boolean modifier (modifying NOT) or a "modifier modifier" (modifying
PROX). ('m trying
to come up with an example for the PPT I'm preparing, for the OGC meeting,
something along the lines of "find cities with name 'washington' not
within 50 miles of a city with name 'baltimore' ".) Back up and
recall (nearly 20 years ago) that we had this conversation for Z39.50 as
reflected in: http://www.loc.gov/z3950/agency/markup/09.html -------------------------------------------------------- 3.7.2.1 The
Proximity Test
--------------------------------------- In
other words, in Z39.50 we have an exclusion flag for this purpose, which we
don't have in CQL. (Thanks to Ralph, who first articulated the
distinction. I still remember, after all these years. Or was it Bob
Waldstein. Oh well. Many Mark Hinnebusch.) So I think that
rather than changing proximity from a boolean to a boolean modifier, maybe we
should just add this "exclusion" flag. Anyone
agree with me on this? --Ray |
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