PlayerPrefs are covered, e.g. lightweight player preferences that are saved to the device, but I don’t believe anything larger in scope than that.
I do have the Adventure Game Creator Framework that I am working on as a little project which currently provides support for reading in XML data, I create a small piece of code for generating it in the first instance also to save me some typing 
The plan is to later expand on the data source support so that both web services and potentially direct database access are supported.
You are welcome to have a look at that and see how I’ve achieved it if you want to - the existing topic with the download to the project as per the last build is here.