[libxml++] [patch] Namespace class and custom_dom example

[Dan D. <da...@de...>]

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Hi guys,

I implemented XML Namespaces support against the current CVS. I also
made an example custom_dom that demonstrates deriving classes from
Element and using a SAX parser to build a tree of these derived objects
to make it easy to serialize and deserialize a custom DOM. This example
also tests the Namespace.

There are overloaded methods that can take a Namespace object as a
parameter, but I have not tested these. The example, just uses the
methods with prefix or prefix/uri parameters. I imagine the methods that
take a Namespace object might be useful with DOM manipulations. For now,
I wanted to get some implementation feedback for a merge to ease ongoing
development.

I am using this as the basis for a rewrite of the Kino video editor that
uses the W3C SMIL2 for its project file format. We need namespaces
support because we will have Kino specific features in it and only
implement selective SMIL modules while doing other modules a different
way. I will also look at Bakery soon to get ideas about how it
approaches the Document_XML.

+-DRD-+