Using the collector node to generate XML

This flow is an example of using the collector node type which can be found here: https://www.npmjs.org/package/node-red-contrib-collector

After pressing the a, b and c inject buttons, the following XML is output in the debug tab:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
  <a>Value A</a>
  <b>Value B</b>
  <c>Value C</c>
</root>

Pressing the no b button causes the <b>Value B</b> element to be removed again.

[
    {
        "id": "9fdbd217.60243",
        "type": "inject",
        "name": "",
        "topic": "a",
        "payload": "Value A",
        "payloadType": "string",
        "repeat": "",
        "crontab": "",
        "once": false,
        "x": 99.5,
        "y": 150,
        "z": "792ca5d.f86d35c",
        "wires": [
            [
                "fd86696e.027998"
            ]
        ]
    },
    {
        "id": "79ac52f6.8653ac",
        "type": "inject",
        "name": "",
        "topic": "b",
        "payload": "Value B",
        "payloadType": "string",
        "repeat": "",
        "crontab": "",
        "once": false,
        "x": 99.5,
        "y": 210,
        "z": "792ca5d.f86d35c",
        "wires": [
            [
                "fd86696e.027998"
            ]
        ]
    },
    {
        "id": "fabedd69.05412",
        "type": "debug",
        "name": "",
        "active": true,
        "console": "false",
        "complete": "payload",
        "x": 588,
        "y": 236,
        "z": "792ca5d.f86d35c",
        "wires": []
    },
    {
        "id": "d5ea0edd.2a15f",
        "type": "inject",
        "name": "",
        "topic": "c",
        "payload": "Value C",
        "payloadType": "string",
        "repeat": "",
        "crontab": "",
        "once": false,
        "x": 99.5,
        "y": 330,
        "z": "792ca5d.f86d35c",
        "wires": [
            [
                "fd86696e.027998"
            ]
        ]
    },
    {
        "id": "fd86696e.027998",
        "type": "collector",
        "name": "",
        "onlyIfChanged": false,
        "x": 274.5,
        "y": 236,
        "z": "792ca5d.f86d35c",
        "wires": [
            [
                "28ef5db8.d710a2"
            ]
        ]
    },
    {
        "id": "74355c29.8bcaa4",
        "type": "inject",
        "name": "no b",
        "topic": "b",
        "payload": "",
        "payloadType": "none",
        "repeat": "",
        "crontab": "",
        "once": false,
        "x": 99.5,
        "y": 270,
        "z": "792ca5d.f86d35c",
        "wires": [
            [
                "fd86696e.027998"
            ]
        ]
    },
    {
        "id": "28ef5db8.d710a2",
        "type": "xml",
        "name": "",
        "x": 430,
        "y": 236,
        "z": "792ca5d.f86d35c",
        "wires": [
            [
                "fabedd69.05412"
            ]
        ]
    }
]