Chapter 2—General principles of criminal responsibility
Part 2.2—The elements of an offence
Division 4—Physical elements
4.3 Omissions
An omission to perform an act can only be a physical element if:
(a) the law creating the offence makes it so; or
(b) the law creating the offence impliedly provides that the offence is committed by an omission to perform an act that there is a duty to perform by a law of the Commonwealth, a State or a Territory, or at common law.
EDIT.