names of data files Naming Convention!

Hello

My question is maybe stupid, but I'm not sure of the my control/log/dbf file naming convention. I am oracle 11g and asm is configured with active OMF. When I checked the file name, I get filename with certain numbers. What this number means.
ASMCMD> ls
EXAMPLE.265.790927371
ONKAR.267.791219239
SYSAUX.257.790927221
SYSTEM.256.790927219
UNDOTBS1.258.790927221
USERS.259.790927223
ASMCMD> 
Could someone tell me please what these numbers represent? I tried google, but not got reasonable answers.

-Onkar

http://docs.Oracle.com/CD/E11882_01/server.112/e18951/asmfiles.htm#i1023283

First number is the number of folder (not in the database, but in ASM), and as I noticed, the files of 'user' (from ASM instance view) begin 256. 'Progressive', as ASM fichier_parametres and OCR files are less than 256.
Second number is incarnation, which is derived from the date and time when the file is created.

These two ensure uniqueness of the names of files in ASM.

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