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Re: [xml-dev] The triples datamodel -- was Re: [xml-dev] SemanticWeb permathread, iteration n+1

From: Henrik Martensson <henrik.martensson@--------.-->
To: Alaric B Snell <alaric@------------.--->
Date: 6/6/2004 8:47:00 AM
On Sun, 2004-06-06 at 00:06, Alaric B Snell wrote:

> Information about the structure of a site gleaned from viewing the 
> source may be subject to random change; if the site published a schema 
> (be it a formal machine-readable schema or a paragraph of text like 
> above), they would then have the opportunity to also state how far users 
> can rely on that not changing in future. They may lie, of course, but 
> people will have more cause to complain if they "said" they wouldn't 
> change it; so when some software that relies on it breaks, the author of 
> the software can say "Hey! The news site broke its promise" rather than 
> "Uh, I made an assumption that no longer holds"...

They did make a promise about what schema to use:

<!DOCTYPE html 
     PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

Using the XHTML 1.0 doctype declaration constitutes a promise to stick
to XHTML, and not to mix in elements and attributes from namespaces
that have not been declared in the XHTML DTD.

And of course, they used non-conformant markup:

<blockquote cite=
Always do a tag-share analysis before writing an XML
up/down/cross-translate in XSLT or DOM/SAX or whatever. 
A remarkably small number of element types make up the 
bulk of the markup - <em>regardless of the size of the schema</em>.
<p>--Sean Mcgrath <br />
Read the rest in <a href=
XML tag share analysis and power law distributions </a>

So, it would be fully justifiable to say that the site made a promise about what schema to use, and broke it.

I wonder why, though. I can understand bending, or even breaking, rules when
there is a distinct advantage to it. There does not seem to be in this
case, because they could just as easily have done this:

<div class="quoteoftheday">



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