Re: [xml] Namespace declaration parent, doc: also broken?

[Anthony Carrico <acarrico memebeam org>]

On Mon, Feb 09, 2004 at 05:54:08AM -0500, Daniel Veillard wrote:
> I can't really change it in a clean way now.

Understood, I'm working around this issue.

> What is the relevance of building a document to print a namespace
> node in isolation, namespaces must be within an element, so the
> element context should be used, I can't follow your reasoning
> there. You can't put an xmlNs node as the child of a document node.

In that case, the xmlNs node would have a temporary parent element,
and a temporary grandparent document. I'm sorry that my logic doesn't
make any sense out-of-context. Maybe an example is worth a thousand
words:

  $ python
  Python 2.3.3 (#2, Jan 13 2004, 00:47:05)
  [GCC 3.3.3 20040110 (prerelease) (Debian)] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from funkxml import *
  >>> bogus_ns = "http://bogus/";
  >>> nsd = NsDecl("bogus", bogus_ns)
  >>> greet = ExpName("greet", bogus_ns)
  >>> doc1 = Doc(Element("bogus", greet, nsd, "hello world"))
  >>> doc2 = Doc(Element("bogus", greet, nsd, "goodbye"))

In this case, doc1 and doc2 share a single namespace declaration. That
namespace declaration has an independent existence.

  >>> print nsd
  xmlns:bogus="http://bogus/";

  >>> print doc1
  <?xml version="1.0"?>
  <bogus:greet xmlns:bogus="http://bogus/";>hello world</bogus:greet>

  >>> print doc1.root
  <bogus:greet xmlns:bogus="http://bogus/";>hello world</bogus:greet>

  >>> print doc1.root.ns_decls[0]
  xmlns:bogus="http://bogus/";

  >>> print doc2.root.ns_decls[0]
  xmlns:bogus="http://bogus/";

In Python, print calls __str__, which is just:

    def __str__(self):
        return self.serialize(indent=True)

For everything except namespace declarations, serialize is just this:

    def serialize(self, encoding=None, indent=False):
        n = None
        try:
            ignore, n = self.to_libxml2()
            return n.serialize(encoding, indent)
        finally:
            if n: n.get_doc().freeDoc()

Unfortunately namespace declarations must do something different
because of the issue at hand. Too bad, but no big deal.

>   So in any case adding a parent link instead of a document link sounds
> far more generic, no ?

Sure, if you ever revisit the architecture, a parent link would be
fine, since the document link is only one step away through the parent
element. The other nodes have both, so I only mentioned both for that
reason.

-- 
Anthony Carrico

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