The Bundle take the name of a data file as a parameter and returns the result as json tree. The text file is a CSV where each line is formatted as follows: node_id|parent_id|node_name

The web\plainphp\build-tree.php is a simple php code that converts the data source file in json tree. The web\plainphp\extjs-tree.html builds a tree from input data in the format json with a ExtJS-tree component.