Re: native xml processing vs what Postgres and Oracle offer
From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 01 Dec 2008 22:50:18 GMT
Message-ID: <KSZYk.1597$yK5.634_at_edtnps82>
>
> I didn't say anything about a heirarchical model. I'm arguing that the
> content of a forum--messages and responses to messages--is in essence
> heirarchical. This is not about how messages are displayed, it's about what
> they are: each message either starts a topic or is a reply to another
> message.
> ...
>
> The essence of a heirarchy is precedence. A heirarchy is a collection of
> individuals (objects) connected in such a way that each individual has at
> most one direct predecessor and that no individual can be a direct or
> indirect predecessor of itself. Records and the position of records are at
> best orthogonal.
>
Date: Mon, 01 Dec 2008 22:50:18 GMT
Message-ID: <KSZYk.1597$yK5.634_at_edtnps82>
Brian Selzer wrote:
> "paul c" <toledobythesea_at_oohay.ac> wrote in message
> news:fqSYk.1429$yK5.577_at_edtnps82...
>> Brian Selzer wrote: >>> "paul c" <toledobythesea_at_oohay.ac> wrote in message >>> news:nUeXk.560$si6.520_at_edtnps83... >>>> rpost wrote: >>>>> paul c wrote: >>>>> >>>>>> patrick61z_at_yahoo.com wrote: >>>>> [...] >>>>> >>>>>>> Actually, usenet is often displayed as being hierarchical, for >>>>>>> instance with so called "threaded" newsreaders, because within a list >>>>>>> of discussions, replies to replies are often more comprehensible when >>>>>>> you can follow the subthreads. >>>>>>> ... >>>>>> Nobody said there's anything wrong with hierarchical displays (or >>>>>> hierarchical physical storage for that matter). >>>>> [...] >>>>> >>>>>> As the general level of literacy continues to decline more and more of >>>>>> those who fail to recognize the possibility of a logical model will >>>>>> have >>>>>> to put up with that dwindling breed. >>>>> You're evading the question. >>>>> ... >>>> What question would that be? (The original question was to do with the >>>> best product to use to display hierarchical data. The OP planned to >>>> invent his own forum, presumably not Usenet-based. I pointed out that >>>> he was wrong to assume a forum is hierarchical.) >>>> >>> Pardon me for sticking my nose in, Paul, but you are ignoring facts as >>> plain as day: The content of a forum is a directed graph without any >>> circuits--that is, a collection of trees--each message being a node and >>> each response being a directed edge. How can you possibly argue that it >>> is not heirarchical? >>> >> I'm amazed that in this day and age there can be any dispute about >> something so simple. As I said before, one may choose to display messages >> in a hierarchical way, but that is not at all the same thing as basing a >> server or reader on a hierarchical model. >>
>
> I didn't say anything about a heirarchical model. I'm arguing that the
> content of a forum--messages and responses to messages--is in essence
> heirarchical. This is not about how messages are displayed, it's about what
> they are: each message either starts a topic or is a reply to another
> message.
> ...
>> The essence of a hierarchy is position and record order. Position ignores >> the Information Principle and the order is logically extraneous. >>
>
> The essence of a heirarchy is precedence. A heirarchy is a collection of
> individuals (objects) connected in such a way that each individual has at
> most one direct predecessor and that no individual can be a direct or
> indirect predecessor of itself. Records and the position of records are at
> best orthogonal.
>