Oh, I think I found what you mean. Apparently they refer to the SRD as the Online Rules Reference. I had no idea. Thanks!While I was looking at OSE, I saw their online reference material. I forget the name exactly, but it was ORR.
For what it’s worth, and it may not be much if you’re not interested, none of the Advanced stuff is in the SRD. Unlike the Classic Fantasy books, which is mostly available as open game content, most of Advanced Fantasy was declared Product Identity under the OGL.