You can do this at runtime, by Using the the www component and parsing the xml into a string variable, then use datamaker to to add this to a datamaker xml proxy on an object (optional), you can then use the datamaker get node action to get the "True/False" node.
Checking its status every frame may be overkill for what you need and cause performance issues, I would add a loop to the above with a wait and run it every 1-2 seconds.
I used exactly the same process for pulling a list of places from google places API at runtime, and it works great.
Let me know if you need anything else, happy to share screenshot if needed.
A