Jack there's no standarisation although there should be - all Australian Operators have different commands - some are logical - some are not - let's hope they are not practically tested with real pax.
If your keen though - have a read: Like al good govt funded research there are some valuable reccomendations............... which is probably why they have never been acted upon.
ATSB Report : Public Attitudes, Perceptions and Behaviours towards Cabin Safety Communications.
http://www.atsb.gov.au/publications/2006/b20040238.aspx