Help with XML_Tree

Does anyone know of any tutorials anywhere on the web? Or could someone give me a sample how to use this class? I've been spending the last several hours trying to figure this out but am having nothing but problems. Here is my code: $XMLStr = '<Items><Item><ItemName>blah</ItenName></Item><Item><ItemName>blah</ItenName></Item></Items>' $xmlTree =& new XML_Tree(); $xmlRoot = $xmlTree->addRoot( 'AllItemsRoot' ); $xmlNode = $xmlTree->getTreeFromString( $XMLStr ); $xmlRoot->insertChild( 'AllItemsRoot/', 0, $xmlNode ); $xmlTree->dump(); One of the following occurs depending on how I fool about with my code to try to get it to work: * I get an error when I try to insert the child * Only the root node prints out (ie, <AllItemsRoot></AllItemsRoot>) and nothing else * Only the part of the structure that begins with <Items> prints out. I'm trying to build a larger XML document by piecing together smaller XML documents. Just that nothing I've tried works. Any help would be greatly appreciated! thnx, Christoph