scubalaurel:....snip....
And what is the big deal?
The term Holgarthian won't help you much in terms of purchasing equipment. "Holgarthian" is a set principles (such as minimalism and elimination of danglies, breathing the long hose and so on) and not a prescriptive list of what's ok and what's not.
There is something to be said for both ways. A set of principles encourages change and innovation--with not every change being desireable in the long run. A set of standards on the other hand is easy to describe, communicate and enforce, which was an essential focus in the development of DIR.
DIR also goes further by describing items such as gas selection that Holgarthian doesn´t describe or discuss to my knowledge.
R..
Edit: BTW, here is a link to a short article about the "principles" of Holgarthian diving..... Good read, fairly short.
http://www.cavedivers.com.au/articles/hogarth.htm