No, you are not searching for it. But it allows a flexible structure for loading and saving.(load it all at once).

But for example you could save like this:

playerprofile
level
playerprofile

or like this:
playerprofile
playerprofile
level
level

The ids tell you which type of content is coming when loading.
The same loading routine which uses different subloading routines, based on IDs can load both files.
Normally, you should seperate level files from profiles.
But thats up to you.