In Android context, what are "opaque binary blobs" (OBBs)?

This concept was introduced to Android 2.3, for instance here
http://developer.android.com/reference/android/os/storage/StorageManager.html
It seems they are some sort of a-whole-filesystem-in-a-single-file. Though 
this raises the question about how to create OBBs and if their file 
structure follow any publicized/open standard. 
I guess they are useful for multiple applications sharing a big piece of 
data, for instance many navigation applications sharing a single OBB with 
map data.

Also check out this currently unanswered question at Stack 
Overflow<http://stackoverflow.com/questions/4524981/what-is-obbopaque-binary-blob-in-android-develop-site>
.

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