file type detection : "complete" order

guys/experts:
sorry If I'm asking an idiot question...
I'm learning about auto detection of file type and apply my own syntax
highlight+folding based on it.
so overall we have following machnism:

1) ex: set ft=
2) modeline: vim:ft= ..
3) $VIMRUNTIME/filetype.vim
4) ~/.vim/ftdetect/xxx_filetype.vim
5) ....

what's the complete logic/detect order in place here?

help ftdetect does give me a lot of good info, but I'm not sure in what
sequence vim applies them?

thanks

regards
ping

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