function &setRootNode(&$node)
{
if (XMLNode::validClass($node)) {
$node->setDocument($this);
$node->node_level = 0;
$this->root_node =& $node;
}
return $this->root_node;
}
function &appendChild(&$newChild)
{
//Appends the node newChild at the end of the child nodes for this node
if (XMLNode::validClass($newChild)) {
// set current document
$newChild->node_level = $this->node_level + 1;
$newChild->setDocument($this->getDocument());
// no child
if (!isset($this->child)) {
$newChild->parent_node =& $this;
$this->child =& $newChild;
} else {
// get last child
$child =& $this->child;
while (isset($child->sibling)) {
$child =& $child->sibling;
}
$newChild->parent_node =& $this;
$newChild->previous_sibling =& $child;
$child->sibling =& $newChild;
}
}
return $newChild;
}
