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Re: Non locator use of URIs

• To: XML Developers List <xml-dev@l...>
• Subject: Re: Non locator use of URIs
• From: "G. Ken Holman" <gkholman@C...>
• Date: Sat, 24 Dec 2005 12:30:14 -0500
• In-reply-to: <43AD7B6D.80903@m...>
• References: <43AD7B6D.80903@m...>

At 2005-12-24 11:46 -0500, Elliotte Harold wrote:
>I'm collecting a list of non-locating, identifying uses of URIs. 
>e.g. where are URIs used in practice as identifying strings? So far I have:
>
>XML Namespaces
>SAX Feature and Properties
>Atom IDs
>RDF/Owl/SemWeb
>XML encryption data types and algorithms
>XML canonicalization algorithms
>
>Can anyone add to this list? The criterion is that the URI is not 
>necessarily resolvable, and not intended primarily to be resolved. 
>It's OK is some can be (e.g. RDDL documents for XML namespaces) as 
>long as it doesn't have to be to serve its main function.

(1) To qualify the top-level constructs of XSLT stylesheets:  every 
named user stylesheet construct in XSLT is a namespace-qualified 
name, though most people use no namespace for these names.  It is 
important in top-level constructs to use namespace qualification when 
using the import tree to pull in many stylesheet fragments from 
different development teams.  To ensure no unintended name conflicts 
you want to isolate the top-level constructs with unique namespace URI strings.

(2) To identify colour profiles in XSL-FO instances:  one maps a 
local name to a URI string recognized by an XSL-FO engine as 
representing a particular colour rendering system.  Then, in the 
XSL-FO, one engages the use of a colour system through the local name.

No namespace resolution is at all involved in these distinctions.

. . . . . . . . . . . Ken

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• References:
  • Non locator use of URIs
    • From: Elliotte Harold <elharo@m...>

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