Actual syntax for oranfstab - where is it documented

There are lots of examples on MOS and in the Oracle documentation of what oranfstab should look like, but I can't find a definitive syntax document.
Is this allowed?

server: xyz
path: 1.2.3.4
local 1.2.5.6
export: /export/foo mount: /mnt/foo
path: 1.2.7.8
local: 1.2.5.9
export: /export/bar mount: /mnt/bar

server:abc
.
.
.
.
Also, is it allowed to have the server name appear more than once in the oranfstab?  For example:

server: xyz
path: 1.2.3.4
local 1.2.5.6
export: /export/foo mount: /mnt/foo

server: abc
path: 2.3.4.5
local: 2.3.5.6
export: /export/def  mount: /mnt/def

server: xyz
path: 1.2.3.4
local 1.2.5.6
export: /export/foo1 mount: /mnt/foo1