'Method to resolve this form element against the calling resource.
To be implemented in subclass.
@param resource: the resource
@return: a tuple
form element,
original field name,
Field instance for the form renderer
The form element can be None for the main table, the component
alias for a subtable, or this form element instance for a
subform.
If None is returned as Field instance, this form element will
not be rendered at all. Besides setting readable/writable
in the Field instance, this can be another mechanism to
control access to form elements.'

def resolve(self, resource):

    return (None, None, None)
