I wish to replace the entire contents of a jstree tree with new json data.

I'm using jsTree 1.0 downloaded July 25, 2011 from github

Say I have this function...

function init_my_tree(my_json_data)
{
  $("#demo1").jstree({
    themes: {
      "theme": "classic",
      "dots": false,
      "icons": true,
      "url": "//js.myliburl.com/jstree/themes/classic/style.css"
    },
    json : {
      data : my_json_data
    },
    plugins : [ "core","ui","themes", "json" ]
  });
}

where demo1 refers to a 

<div id="demo1"></div>

What I'm trying to do is to completely replace the tree with new data that I load from my server. For purposes of this question, however, let's pretend I just want to do this...

$(document).ready(function() {
  var text_data = '[{"title":"All","data":{"jstree":{"opened":true}},"children":[{"title":"Item 1","data":{"jstree":{}},"children":false,"li_attr":{"id":"1","class":"jstree-leaf","href":"#"},"a_attr":{"href":"#"}},{"title":"Item B","data":{"jstree":{}},"children":false,"li_attr":{"id":"2","class":"jstree-last","href":"#"},"a_attr":{"href":"#"}}],"li_attr":{"id":"0","class":"jstree-last","href":"#"},"a_attr":{"href":"#"}}]';
  var my_json_data = $.parseJSON(text_data); 
  init_my_tree(my_json_data);  // initialize the tree view

  text_data = '[{"title":"Something Else","data":{"jstree":{"opened":true}},"children":[{"title":"Item A","data":{"jstree":{}},"children":false,"li_attr":{"id":"1","class":"jstree-leaf","href":"#"},"a_attr":{"href":"#"}},{"title":"Item 2","data":{"jstree":{}},"children":false,"li_attr":{"id":"2","class":"jstree-last","href":"#"},"a_attr":{"href":"#"}}],"li_attr":{"id":"0","class":"jstree-last","href":"#"},"a_attr":{"href":"#"}}]';
  my_json_data = $.parseJSON(text_data); 
  init_my_tree(my_json_data);  // re-initialize the tree view to load with new data

});

I'm doing this based on this l

jquery jstree
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