RE: [xml] bug in libxml-1.8.10

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From: Jordan Henderson (jhenderson@daynt1.daas.dla.mil)
Date: Thu Sep 07 2000 - 12:11:55 EDT

Thanks, I knew there had to be a justification.

Seems like there are a huge potential number of problems here. The two biggest
that come to mind being inconsistent handling of trailing whitespace and
conversions of line terminating characters.

Hmmmm... Is there good support for making all white space very clear (I'm not
sure how to do this with line terminators) in the libxml debugging modes?

> -----Original Message-----
> From: Daniel Veillard [mailto:Daniel.Veillard@w3.org]
> Sent: Thursday, September 07, 2000 11:52 AM
> To: xml@rpmfind.net
> Subject: Re: [xml] bug in libxml-1.8.10
>
>
>
> On Thu, Sep 07, 2000 at 11:33:29AM -0400, Jordan Henderson wrote:
> >
> > Can anyone point me to the justification for making white
> space significant in
> > XML?
> >
> > When I heard about this, I couldn't hardly believe it. I
> know this is going to
> > cause a
> > million niggling problems like this one.
>
> I don't have pointer handy, but there were quite some discussions
> about this problem in the markup community. Here is what I understand:
>
> Let's take the following document, now design a rule where
> you can be sure what spaces are ignorable and whose are really the
> author intent (remember that carriage returns are spaces):
> ---------------------
> <p>
> <a></a>
> <a> </a>
> <a> abc </a>
> <a> <b>abc</b> </a>
> <a>
> <b>abc</b>
> </a>
> <a>
> <b>abc</b>
> </a>
> <a><b>abc
> </b></a>
> <a>
> <b>abc
> </b>
> </a>
> </p>
> ---------------------
> If you don't have a DTD to check against a content model this is
> impossible. Even with a DTD it's not possible to always tell.
> More than 10 years of work on SGML were not able to bring a decent
> solution to this problem. As a result all spaces are significant
> (and even if you validate, and are guaranteed that one doesn't have
> a mixed content-model, most of the XML DOM parser will provide the
> white spaces).
> It's better to have a specific policy enforced at the application
> level than a broken policy at the parser level.
>
> Daniel
>
> --
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