Re: [xml-dev] The purpose of a namespace URI is ...

Roger,

I'm going to respond in a manner rather different from the others who 
answered your query.  Note that I do not necessarily disagree with 
the other responders, but I think taking a step back from the XML 
context will be helpful.

* A "namespace" is a collection of names, either explicitly (e.g., a 
list of names in a specific context) or implicitly (an unenumerated 
collection of possible names for use in a specific context).

* A "namespace identifier" (or "namespace name") is a name that 
identifies a namespace.

* A "namespace URI" is a particular kind of name (structured using 
the rules of RFC 3986, Uniform Resource Identifier (URI): Generic 
Syntax) that identifies a namespace.

And that's all there is to it.

In the context of XML, the document entitled "Namespaces in XML 1.0", 
a resource found on the WWW using the Universal Resource Identifier 
(URI) http://www.w3.org/TR/xml-names, defines the use of namespaces 
and namespace identifiers in the context of XML.

XQuery supports the use of namespaces in the XML that queries might 
consume or produce.  XSLT does that, and it also uses namespaces in 
its own language, which uses an XML syntax.  XQueryX does the same.

However, XQuery also uses namespaces for other purposes, such as 
partitioning the universe of names into several spaces used for 
different purposes, such as one for errors, another for modules, 
another for serialization options, etc.

Hope this helps,
    Jim


At 11/30/2012 05:35 AM, Costello, Roger L. wrote:
>Hi Folks,
>
>     A namespace URI conventionally identifies
>     the component, subsystem, or authority
>     responsible for defining the meaning of
>     an XML vocabulary.
>
>Do you agree?
>
>/Roger
>
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Jim Melton --- Editor of ISO/IEC 9075-* (SQL)     Phone: +1.801.942.0144
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