[XML-SIG] Writing DOM-neutral code

[Mike Olson]

On Wed, 2001-12-05 at 13:36, Rich Salz wrote:
> I know that on the face of it that's a silly question -- it's the whole
> point of having a standard (albeit crappy:) API.
> 
> If I have an element, e, then
> 	Using pyxml (4dom) dom, e.attributes is a list
> 	Using cDomlette, e.attributes is a dictionary;
> 		e.attributes.values() is what is needed

Here is the class definition I have for a NamedNodeMap in 4DOM.  Has
someone changed it recently?

class NamedNodeMap(UserDict.UserDict):
    def __init__(self, ownerDoc=None):
        UserDict.UserDict.__init__(self)


> 
> Within PyXML I have xml/dom/ext/c14n.py, and I also have ZSI
> (pywebsvcs.sf.net), and I want to support both the full rich dom and the
> lean and mean fast one.

It should work.  4XPath, 4xslt, 4XLink, 4XPointer, 4RDF, etc all support
4DOM, pDomlette, cDomlette and to some extent minidom.

Mike


> 
> Anyone have any general approaches to this?  Right now, I'm about to
> check this change into c14n.py:
> 
> +def _attrs(E):
> +    '''Get the sequence of attribute nodes, even if the DOM uses a
> +    dictionary.'''
> +
> +    a = E.attributes
> +    if not a: return []
> +    if type(a) == type({}): return a.values()
> +    return a
> +
> 
> ?
> 	/r$
> 
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