When overridden in a derived class, moves the System.Xml.XPath.XPathNavigator to the next sibling node of the current node.
true if the System.Xml.XPath.XPathNavigator is successful moving to the next sibling node; otherwise, false if there are no more siblings or if the System.Xml.XPath.XPathNavigator is currently positioned on an attribute node. If false, the position of the System.Xml.XPath.XPathNavigator is unchanged.