From: Philippe Verdy (firstname.lastname@example.org)
Date: Tue Oct 02 2007 - 11:22:32 CST
Dmitry Turin wrote:
> Computer in both field of rational database and full-text database
> must compare only 'sense' itself of text.
> Let me refer once again to rough equality of strings
Please stop referencing your *own* external references, always on your own
website (which contains lots of errors, and a very confusive and
inconsistent terminology, the inconsistence being the worst problem, because
a confusive terminology would not be a severe problem, provided that you use
it consistently and with precise definitions) as if they were proofs of
Really you need to make progresses in English, or you should work in Russian
to make sure that your proposals are consistent and it's difficult for you
to use a non-confusive English terminology.
Why don't you start by reading the Unicode standard to get a stable
terminology with their definitions?
I completely disagree your opinion that a "full-text database *must* (sic!)
compare one 'sense' itself (sic! Do you mean semantic?) of text. There's no
such requirement in databases: a database does not compare anything, you're
mixing it with a database application, which is not even required (your
"must") to compare things semantically:
In most database applications this is completely false, as entities are
compared in most cases for strict equality, to implement relations between
equal keys in the data model (and in database models with normalized forms,
theses keys are not even encoded as text, but as numeric entities or
symbolically as strict identifiers, with a complete absence of semantic
except being a unique identifier, whose internal encoding does not matter as
this is transparent data).
Weak relations based on semantic relations are NOT implemented in almost all
relational database engines. What is really implemented is named "collation"
and it is not used for building the data model but for performing queries
with "range" constraints.
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