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RE: namespace URI of xmlns prefix

• To: "John Heinstein" <jheinstein@e...>,<xml-dev@l...>
• Subject: RE: namespace URI of xmlns prefix
• From: "Dare Obasanjo" <dareo@m...>
• Date: Fri, 15 Jul 2005 13:52:38 -0700
• Thread-index: AcWJchQoVsoNj6vZQW2puQTXoli/RwADOq0g
• Thread-topic: namespace URI of xmlns prefix

From http://www.w3.org/XML/xml-names-19990114-errata

"The prefix xmlns is used only to declare namespace bindings and is by
definition bound to the namespace name http://www.w3.org/2000/xmlns/. It
must not be declared. No other prefix may be bound to this namespace
name"


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> -----Original Message-----
> From: John Heinstein [mailto:jheinstein@e...] 
> Sent: Friday, July 15, 2005 12:10 PM
> To: xml-dev@l...
> Subject:  namespace URI of xmlns prefix
> 
> Hi,
> 
> Could someone clarify part of the XML Namespaces spec for me?
> 
> The spec states that namespace declarations are a special category of
> attribute: "A namespace is *declared* using a family of 
> reserved attributes. Such an attribute's name must either be 
> |xmlns| or have 
> |xmlns:| as a prefix".
> 
> So if a namespace declaration like
> xmlns:foo="http://www.foo.com/some.namespace" is made, and 
> that declaration is considered a type of attribute, then:
> 
> - the namespace prefix of the attribute is "xmlns"
> - the local name of the attribute is "foo"
> - the value of the attribute is "http://www.foo.com/some.namespace"
> 
> But what is the namespace URI of the attribute? What 
> namespace does the prefix "xmlns" belong to?
> 
> And then you have default namespace declarations, such as 
> xmlns="http://www.foo.com/some.namespace".
> 
> - the namespace prefix of the attribute is an empty string: ''
> - the local name of the attribute is "xmlns"
> - the value of the attribute is "http://www.foo.com/some.namespace"
> 
> And I presume in this case, the namespace URI would be an 
> empty string?
> 
> I'm asking because I'm unsure how a DOM method like 
> getAttributeNS is supposed to deal with namespace 
> declarations. Would xmlns attributes simply be ignored in this case?
> 
> John Heinstein
> 
> --
> John Heinstein
> VP Software Development
> Engage Interactive
> 921 College Hill Rd.
> Fredericton, NB
> E3B 6Z7
> 
> phone: (506) 460-1627
> fax: (506) 460-1626
> 
> http://www.engageinteractive.com
> 
> 
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