StoredNode parent = (StoredNode) getParentNode();
Node parent = getParentNode(); if (parent.getNodeType() == Node.DOCUMENT_NODE) return null;
	public Node getPreviousSibling() {        StoredNode parent = (StoredNode) getParentNode();        PreviousSiblingVisitor visitor = new PreviousSiblingVisitor(this);        parent.accept(visitor);        return visitor.last;	}