As long as you are changing some of this code, I believe the ID should be numeric anyway --- `<205>` is an example I receive via MMS.

Maybe we just do something like this

```js
var uniqueId = 1;
function SMIL_generateUniqueLocation() {
   return uniqueId++ % 1000;
}
```

The `%1000` is just because I've never seen one over three digits long either.   Thoughts @steveck-chung ?