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   Namespaces on Attribute Names

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  • From: David Megginson <david@megginson.com>
  • To: xml-dev@ic.ac.uk
  • Date: Mon, 20 Jul 1998 15:06:43 -0400

Murray Altheim writes:

 > This of course required that I add a namespace variable to my class def.
 > for Element. I have not yet added any support for namespaces on attributes,
 > as I can't understand the rationale.

Can't understand, or don't agree with?  I have to admit that I have
been uncomfortable with the idea myself.

In any case, I'll offer myself as a victim to your pseudo-Socratic
feigned ignorance, and suggest that namespaces on attributes are meant
to represent a kind of implicit multiple inheritance, where the
derived class is never explicitly named.  Compare the following (the
CRTC is the Canadian government's big-brother media supervisor -- if
anyone wants to get me started on the CRTC, send private

XML Excerpt

  <doc id="xxx" LC:refNo="BS123.456 1998" CRTC:rating="family">

Conceptual Equivalent in C++

  class LC
    String &getRefNo ();

  class CRTC
    String &getRating ();

  class Doc 
    String &getId ();

  // This class is implicit.
  class MyDoc : public Doc, public LC, public CRTC

All the best,


David Megginson                 david@megginson.com

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