My EPR format is a dynamic props script that t.ed exports (you do NOT have to buy t.ed to use my loader/management code) maybe its what you are looking for (or can at least give you some ideas).
The code to handle dynamic props is freely available and so is the open file format under the 'world loader code' section on the ted page.
The code to handle dynamic props is freely available and so is the open file format under the 'world loader code' section on the ted page.