Usage of nsIAccessNode Interface

 The first nsIAccessNode child

readonly attribute nsIAccessNode firstChildNode

 The last nsIAccessNode child

readonly attribute nsIAccessNode lastChildNode

 The next nsIAccessNode sibling

readonly attribute nsIAccessNode nextSiblingNode

 The parent nsIAccessNode

readonly attribute nsIAccessNode parentNode

 The previous nsIAccessNode sibling

readonly attribute nsIAccessNode previousSiblingNode

 Get the nth child of this node
 @param childNum Zero-based child index
 @return The nth nsIAccessNode child

nsIAccessNode getChildNodeAt(in long childNum)

 Returns the access node cached by this document
 @param aUniqueID The unique ID used to cache the node.
                  This matches up with the uniqueID attribute on
                  nsIAccessNode.
 @return The nsIAccessNode cached for this particular unique ID.

[noscript] nsIAccessNode getCachedAccessNode(in voidPtr aUniqueID)

 Return an nsIAccessNode for an already created DOM node in the given weak shell.
 Does not create a new one -- only returns cached access nodes.
 @param aNode      The DOM node to get an access node for.
 @param aPresShell The presentation shell which contains layout info for the DOM node.
 @return The nsIAccessNode for the given DOM node or null if
         an access node does not already exist for this DOM node.

nsIAccessNode getCachedAccessNode(in nsIDOMNode aNode, in nsIWeakReference aShell)