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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Separation of formatting...
Sean Mc Grath wrote:
>
> The "separation of formatting..."
> mantra is a big part of SGML/XML obviously.
Well, no. It is a big mantra often recited by
folks who apply SGML. SGML does not care. It
is important to keep that distinction alive
because otherwise one sinks into the "holiness
of the page metaphor" debates. Those debates usually
end in a discussion of target granularity and
searching requirements. Pixel/raster memory
does not care either.
> However, it works on a number of levels.
>
> Here is a pieces of data marked up three ways:-
>
> Version 1 : Purely Formatting Mindset (RTF)
> "{\i Customer} Joe Bloggs \par"
>
> Version 2 : SGML - Generic Markup
> <p><i>Customer</i>Joe Bloggs</p>
>
> Version 3 : SGML - Data Modelling
> <Customer>Joe Bloggs</Customer>
> Somewhere along the line, people started thinking
> as in version 3 above. I have no idea when this
> started to happen. Anyone out there know?
The first large application of it that I remember
was the US DOD Content Data Model for IETMs. We
did similar things in the US Navy CASS application.
I used it for the US Army IADS DTDs after the
CASS program moved on.
In many cases, it was to help the author use the
editor more precisely by indicating in the menus
what the precise content had to be. As we used
this approach, we found that it helped with
searching and target granularity plus had excellent
lifecycle characteristics, ie, less information
is lost when one does not have to archive a
down-translated chunk of information.
It suffers when one has to aggregate data from
multiple sources without namespaces under a root. For that,
we have traditionally applied switch tags in the
DTD, and while that works, it won't work automatically
which I believe is the requirement for namespaces.
len
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