[XML-SIG] DOM Nodes: Identity test

Andrew M. Kuchling akuchlin@cnri.reston.va.us
Wed, 24 Mar 1999 09:48:08 -0500 (EST)

Carsten Oberscheid writes:
>What is the "official" way to check if a two DOM Node objects are the same?
>The PyDOM implementation, e.g. in the Element.get_parentNode() method, always 
>returns a "fresh" Node object encapsulating the real data in a _nodeData object 
>(right?), so when I do get_parentNode() twice on the same node, I get two 
>different Node objects. Am I supposed to compare the _node members?

	I've been wondering about that myself.  We don't want to
overload __cmp__ to do this, because Python comparisions are usually
done by value; to check if two objects are the same, you'd use the
'is' operator, but we can't overload that operator.  It's probably
best to have a method of Node objects that returns the value of
'self._node is other._node'.  Anyone care to suggest a name?
.equals() offers itself, but that may confuse Java users, because
.equals() is by value and == is by identity in Java.

A.M. Kuchling			http://starship.python.net/crew/amk/
    I like to believe it was only the cold that made me shiver, only a strand
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    Robert walked away across the moor and I never saw him again. Since that
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