Tags for National Parks

I’m adding a bunch of National parks in various states around Australia. Had a look at what’s been used as tags at the moment and there’s no consistency, the most common are:

boundary=national_park (~1100 occurrences)
leisure=nature_reserve (~2300 occurrences)

Map features page recommends n_t so i’m wondering why there are so many taged as n_r?

What’s the convention that most of you guy use in Aus?

As I understand it, there is a formal distinction between a national park and a nature reserve. Here is a list of a myriad of types: http://www.environment.nsw.gov.au/parktypes/typesofparks.htm. Each state has its own “national parks” or environmental department, and buried in its website will be a list of which areas are under which classification.

Diff states call them different things. See http://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines#.28National.2C_State_etc.29_Parks
For the Qld tags used