Path: dp-news.maxwell.syr.edu!spool.maxwell.syr.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newscon02.news.prodigy.com!newscon06.news.prodigy.com!prodigy.net!border1.nntp.dca.giganews.com!nntp.giganews.com!postnews.google.com!j33g2000cwa.googlegroups.com!not-for-mail
From: "Erwin" <e.smout@myonline.be>
Newsgroups: comp.databases.theory
Subject: Re: Operationalize orthogonality
Date: 29 May 2006 03:19:15 -0700
Organization: http://groups.google.com
Lines: 11
Message-ID: <1148897955.538576.154420@j33g2000cwa.googlegroups.com>
References: <447ab7bd$0$31643$e4fe514c@news.xs4all.nl>
NNTP-Posting-Host: 85.91.175.214
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
X-Trace: posting.google.com 1148897960 20600 127.0.0.1 (29 May 2006 10:19:20 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 29 May 2006 10:19:20 +0000 (UTC)
In-Reply-To: <447ab7bd$0$31643$e4fe514c@news.xs4all.nl>
User-Agent: G2/0.2
X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1),gzip(gfe),gzip(gfe)
Complaints-To: groups-abuse@google.com
Injection-Info: j33g2000cwa.googlegroups.com; posting-host=85.91.175.214;
   posting-account=X8fuhQ0AAABWDh2J8fCLiXtyN3QIDVed
Xref: dp-news.maxwell.syr.edu comp.databases.theory:40188

Translate an external representation of a value to an internal one (and
ring a bell if an external representation turns out to be "not a valid
value of this type"), the structure of which is comprehensible to the
dbms's storage engine ???
Translate an internal representation of a value to an external one
(maybe text-like, maybe a format defined by some host language) ???
Define the API that the operator implementations must adhere to ???

I think it 's that kind of stuff.  That is to say : if by "type
system", you understand the same thing as I do.