How-to build a NodeList of ALL nodes in an XMLDocument

Hello List,
I am trying to write a method which takes in an XMLDocument and iterates over each element in the XMLDocument, extracting the value of an attribute, key, and using key to access a HashMap and add an important bit of data to the element.
I am trying to use NodeList as the collection of elements but am having trouble getting either XMLNode.selectNodes(String pattern) or XMLNode.getChildNodes(String pattern) to return a NodeList containing ALL the nodes in the XMLDocument.
Instead it is returning sibling nodes in its list, but not finding the children which these sibling nodes contain.
Am I misuing the API? Is there another way to accomplish this?
Any tips, suggestions, reponses, answers welcome.
TIA,
Alex Reuter

Ok, here is how I am doing it.
I am settling for a nodelist of all nodes which have attributes named key.
XMLNode nodey = othernode;
NodeList list = nodey.selectNodes("descendant::*/@key");
just for posterity..
alex

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