[Zope-dev] more on keyword indexes

[Josh Zeidner]

Hello,

  I did a little more investigiation into the problem, and couldnt really
find any documentation anywhere on what the actual semantics are of keywords
and how they are queried.  For instance:

  I have three classes and each has an keyword index named KW:

  ObjectOne:    KW = ['one','blue','furry']
  ObjectTwo:    KW = ['two','flying','purple']
  ObjectThree:  KW = ['three','one-eyed','purple']

  If I were to query the ZCatalog with the following set of words:
['purple'] I would expect to get:

    ObjectTwo
    ObjectThree

  Right?  If I query the database with ['one','two'] ( if this type of thing
is at all possible ), I get :

    ObjectOne
    ObjectTwo

  This seems like the obvious result: BUT: it depends if you want a AND/OR
type search.  I could also expect to get nothing( if its an AND type search
because no records match 'one' and 'two' ).  Here is better example, what if
I queried: ['purple','one-eyed'].  Would I be expecting only ObjectThree or
[ ObjectThree, ObjectTwo ] ( because they both match the keyword purple( a
logical set-intersection ) ).

  Also I found the keyword indexes to have some more obvious bugs.  If I
only used one keyword for the matching critiria,  for instance if I used
'purple' , I would only get ObjectTwo.  Is anyone else using keyword
indexes?  In what way are you using them?


   Thanks,

   Josh Zeidner

   http://www.brooklynmedialabs.com