Description: A list of custom submit functions that will be called when the element is submitted. This is usually to add additional submit functions to a form, or to use an alternate function rather than the default form validation function which is the form ID with _submit appended to it.
+Description: A list of custom submit functions that will be called when the element is submitted. This is usually to add additional submit functions to a form, or to use an alternate function rather than the default form submission function which is the form ID with _submit appended to it.
Values: An array of function names. Each such function will take $form and $form_state as parameters.
Usage example (node_form()):