Re: Navigation question

dawn wrote:
> mAsterdam wrote:

>> dawn wrote:
[snip]
>>> Add 8 "User Layer" to the OSI layers. My questions are regarding >>> layer 7, where "logical navigation" of a database might take place.

>> The OSI layering hides the complexity
>> in the lower layer from the layers above it by hiding
>> the concepts in the lower layer from the one above it,
>> except for a clean request/service interface.
>>
>> By using RM terms (what layer is that? - hm, dunno,

So 7d and 7a? Sub layers? I don't get it.

>> but for the
>> argument it only matters that it is lower than 8 in your stack)
>> in the added layer 8 you are doing the opposite.

The opposite of hiding the complexity in the lower layer from the layers above it by hiding the concepts in the lower layer from the one above it ...

> I'm agreeing with some who have
> suggested that when we are talking about the user navigating, via the
> code (layer 8), that does not imply we are navigating in layer 7.

... by mixing the terms.

>> earlier:
>>  > The question is whether the logical navigation described above has
>>  > something inherently "bad" about it so that we must always avoid
>>  > coding such navigation into our applications (combination of
>>  > metadata and code, for example).
>>
>> This would be about the application layer, right?

>> (and still good/"bad", and still "logical navigation".)

Mu. Received on Fri Feb 23 2007 - 21:19:00 CET