[SOLVED] Format of Draw.io XML file?

Format of Draw.io XML file?

I created a shape in draw.io and exported it to get its XML file, which looks like this:

<mxlibrary>[{"xml":"vZTNcoIwEMefJnckXjxarF7aXvoEKawk05Blwirap+8SooLa0XbaZoaZ7H8/sssPImRW7VZe1foZC7BCPgqZeUTqd9UuA2tFmphCyIVI04QfkS6/8E6CN6mVB0f3JKR9wlbZDfRKLzS0t1EoPW5qIR88kiL1FuSE7ZgJnmA3Oj1H5yA/hB5bGHUVQmNLK8AKyO85pDUF6Rgxi2kaTKkPaTKKqonNHXNPQ/Imznl9Znkx8wsSNBeD89yugCKO22pD8FqrvPO2DIw1TRUfspjwttGqwPZgkMd3yNCiD6VkFhZ71sbagT4Lq9PR0UBfhsW6sqZ0rFlYU1eYzzeufArWYtpRgcZ8DKhUuB1YUJghsjGZJNS32M69x7aJyt2YhzjTn+H8DZrT21/wX4A8A9O9H5MrO48yYX0V1xjPObz/5rMfY7j59yXf58Xm6TYLvtFl9wk=","w":190,"h":130,"aspect":"fixed","title":"notes"}]</mxlibrary>

Is it possible to insert a new vertex using this data? I don't even know where to begin on this one.

Solution

Finally got this working. Check out the mxCodec example here. So first, get the uncompressed xml for the node either as described by kjhughes or via the Extras -> Edit Diagram menu in Draw.io. Then you can add the node like so:

var xml = '<root><mxCell id="2" value="Hello," vertex="1"><mxGeometry x="20" y="20" width="80" height="30" as="geometry"/></mxCell><mxCell id="3" value="World!" vertex="1"><mxGeometry x="200" y="150" width="80" height="30" as="geometry"/></mxCell><mxCell id="4" value="" edge="1" source="2" target="3"><mxGeometry relative="1" as="geometry"/></mxCell></root>';
var doc = mxUtils.parseXml(xml);
var codec = new mxCodec(doc);
var elt = doc.documentElement.firstChild;
var cells = [];

while (elt != null)
{
  cells.push(codec.decode(elt));
  elt = elt.nextSibling;
}

graph.addCells(cells);

Replace xml with whatever the xml for your node is. Also, be sure not to include

<mxCell id="0"/>
<mxCell id="1" parent="0"/>

as these are the default parents and their inclusion will break the graph by causing infinite recursion.