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RE: namespaces redux (was: Re: [XML Schema]Here's ho

• From: "Costello, Roger L." <costello@mitre.org>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Tue, 16 Oct 2012 09:43:40 +0000

Hello Andrew,

> 3. Avoid using URLs, the globally unique benefit 
> is far outweighed by the confusion cost

Are you recommending that URNs be used rather than URLs?

If yes, doesn't that eliminate the ability to use things such as RDDL?

XML Schema uses URLs for namespaces, as does XSLT. Do you believe that to be a mistake?

What do you mean by "the confusion cost"?

/Roger

-----Original Message-----
From: Andrew Welch [mailto:andrew.j.welch@gmail.com] 
Sent: Tuesday, October 16, 2012 4:35 AM
To: Amelia A Lewis
Cc: xml-dev@lists.xml.org
Subject: Re:  namespaces redux (was: Re:  [XML Schema] Here's how to empower instance document authors to create their own root element)

>> On 10/15/2012 12:09 AM, Liam R E Quin wrote:
>> (in fact, best practices uses of W3C namespaces are not, ultimately, so
> bad).

Here are some namespace best practices for someone about create their
own markup:

1. Always use a prefix, never change the default namespace.
2. Choose a namespace that will never, ever change - eg don't include
version numbers or dates
3. Avoid using URLs, the globally unique benefit is far outweighed by
the confusion cost
4. Keep it short, XPath 3.0 can include the namespace directly in the xpath
5. Use the standard prefixes for existing namespaces
6. Always declare all the namespaces on the root element

The goal is to help consumers of the xml avoid all the usual pitfalls
around namespaces.  Some potentially controversial ones in there...
:)



-- 
Andrew Welch
http://andrewjwelch.com

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• Follow-Ups:
  • Re: namespaces redux (was: Re: [XML Schema]Here's how to empower instance document authors to create their own root element)
    • From: Andrew Welch <andrew.j.welch@gmail.com>

• References:
  • [XML Schema] Here's how to empower instance document authors tocreate their own root element
    • From: "Costello, Roger L." <costello@mitre.org>
  • Re: [XML Schema] Here's how to empower instance documentauthors to create their own root element
    • From: Timothy Cook <timothywayne.cook@gmail.com>
  • Re: [XML Schema] Here's how to empower instance documentauthors to create their own root element
    • From: "Christopher R. Maden" <crism@maden.org>
  • Re: [XML Schema] Here's how to empower instance documentauthors to create their own root element
    • From: John Cowan <cowan@mercury.ccil.org>
  • Re: [XML Schema] Here's how to empower instance documentauthors to create their own root element
    • From: "Christopher R. Maden" <crism@maden.org>
  • Re: [XML Schema] Here's how to empower instance documentauthors to create their own root element
    • From: Liam R E Quin <liam@w3.org>
  • Re: [XML Schema] Here's how to empower instance documentauthors to create their own root element
    • From: "Christopher R. Maden" <crism@maden.org>
  • namespaces redux (was: Re: [XML Schema] Here's how toempower instance document authors to create their own root element)
    • From: Amelia A Lewis <amyzing@talsever.com>
  • Re: namespaces redux (was: Re: [XML Schema]Here's how to empower instance document authors to create their own root element)
    • From: Andrew Welch <andrew.j.welch@gmail.com>