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[Dare Obasanjo]
> This is a hack. A hack I wouldn't suggest people use in practice
> unless they have control over the XML that is being processed
> or can guarantee what prefix<->namespace binding will exist in the
document.
Of course, but then again that is exactly the situation I was describing.
I'm not claiming best practices for every occasion, I'm just illustrating a
kind of task where using the namespaces, and especially the prefixes, makes
life much simpler and more pleasant.
Cheers,
Tom P
________________________________
From: Chiusano Joseph [mailto:chiusano_joseph@bah.com]
Sent: Thu 7/10/2003 10:33 AM
To: Eric van der Vlist
Cc: xml-dev@lists.xml.org
Subject: Re: [xml-dev] Motivations for namespaces (sorry)
<Quote>
This sounds like a really innovative use of namespace prefixes! What
about languages such as Schematron and Relax NG (not to mention
Examplotron which is worse) which use to use a default namespace?
</Quote>
+1 - Additionally, how can one guarantee a uniform usage of namespace
prefixes?
Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Eric van der Vlist wrote:
>
> Thomas B. Passin said:
> > [Eric van der Vlist]
> >>
> >> Chiusano Joseph said:
> >> > Eric,
> >> >
> >
> >> I would argue that in this case, what's identifying your "document
> >> type" is the xsi:schemaLocation more than the namespaces!
> >> My point was rather that namespaces alone are not enough to guess
> >> what's the document as a whole is about.
> >
> > In the task I described a post ago, it is exactly the namespace URI -
> > OK, in practice it really is the prefix, so there! - that is so
> > helpful.
> .../...
> > That's important. That's why virtually all xslt stylesheets use xsl:.
> > That's why virtually all XML Schemas use xs: or xsd:. That's why xhtml
> > documents almost always use html: or xhtml:. It is why we name
> > variables with mnemonic names rather that "dhf340cksdfnmg". It is
> > mostly why we use readable URLs instead of GUIDs.
>
> Thomas,
>
> This sounds like a really innovative use of namespace prefixes! What about
> languages such as Schematron and Relax NG (not to mention Examplotron
> which is worse) which use to use a default namespace?
> Also, let's take a RSS 1.0 document:
>
> <?xml version="1.0" encoding="utf-8"?>
> <rdf:RDF
> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
> xmlns:dc="http://purl.org/dc/elements/1.1/";
> xmlns:sy="http://purl.org/rss/1.0/modules/syndication/";
> xmlns:co="http://purl.org/rss/1.0/modules/company/";
> xmlns:ti="http://purl.org/rss/1.0/modules/textinput/";
> xmlns="http://purl.org/rss/1.0/";
> >
> <channel rdf:about="http://meerkat.oreillynet.com/?_fl=rss1.0";>
> <title>Meerkat</title>
> <link>http://meerkat.oreillynet.com</link>
> <description>Meerkat: An Open Wire Service</description>
> <dc:publisher>The O'Reilly Network</dc:publisher>
> <dc:creator>Rael Dornfest (mailto:rael@oreilly.com)</dc:creator>
> <dc:rights>Copyright © 2000 O'Reilly & Associates,
> Inc.</dc:rights> <dc:date>2000-01-01T12:00+00:00</dc:date>
> <sy:updatePeriod>hourly</sy:updatePeriod>
> <sy:updateFrequency>2</sy:updateFrequency>
> <sy:updateBase>2000-01-01T12:00+00:00</sy:updateBase>
> ...
>
> How do you say that's its a RSS document? If we had to use a "rss" prefix
> for the document element, that would give:
> <?xml version="1.0" encoding="utf-8"?>
> <rss:RDF
> xmlns:rss="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
> xmlns:dc="http://purl.org/dc/elements/1.1/";
> xmlns:sy="http://purl.org/rss/1.0/modules/syndication/";
> xmlns:co="http://purl.org/rss/1.0/modules/company/";
> xmlns:ti="http://purl.org/rss/1.0/modules/textinput/";
> xmlns="http://purl.org/rss/1.0/";
> >
>
> That's technically valid, but isn't it most confusing?
>
> Eric
> --
> Freelance consulting and training.
> http://dyomedea.com/english/
> ------------------------------------------------------------------------
> Eric van der Vlist http://xmlfr.org http://dyomedea.com
> (W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
> ------------------------------------------------------------------------
>
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