[support] hook_submit()

[Davide Galletti]

Dear all,

my first post to this great community!

I wrote a custom module dealing with a node, with its nice hook_submit() 
implementation.
This function is called both when the node is created and when a node is 
updated.

I need to insert a term in a vocabulary and associate it with the node 
when the node is
created; and I need to do nothing when the node is updated.

Which is the way in hook_submit() to understand whether the node is 
being created or updated?


Thanks and apologies in advance as most likely it is an issue I could 
have tackled myself,


Davide