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   Re: Fw: Namespaces

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Thu, 04 Feb 1999 14:00:40 -0500

Oren Ben-Kiki scripsit:

> Is it possible to recast the namespace recommendation as a transformation
> from an XML tree with 'xmlns' attributes and '...:' prefixes into a tree
> which doesn't have them, but with modified element and attribute names, such
> that the semantics of the resulting tree under the rest of the relevant
> recommendations (ignoring namespaces) is preserved?

Of course.  Furthermore, it is possible in one pass.  Check my
namespace filter at http://www.ccil.org/~cowan/XML/NamespaceFilter.java .

> Note that this may require defining a textual form for the transformed tree
> (using "...^...", or "{..}..", or whatever).

And so I do.
> If so, then we'll have a clear definition of just how to add a namespace
> processor on top of a normal XML processor.

Proof by example.

> These two statements seem contradictory to me - if "all" the namespaces do
> is prefix the names with a URI [...].

More accurately: it shows how to map names that contain a colon
to URI-prefixed form; some colon-free element names are also
given URI-prefixed equivalents, but some are not; attribute names
without colons are not given URI-prefixed forms.

John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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