I posted about the appearance of JATS: Journal Article Tag Suite, version 1.1 and then began to lazily browse the pdf.
I forget what I was looking for now but I noticed the table of contents jumped from page 42 to page 235, and again from 272 to to 405. I’m thinking by this point “this is going to be a bear to find elements/attributes in.” I looked for an index only to find none. 
But, there’s hope!
If you look at Chapter 7 “TAG Suite Components,” elements start on page 7 and attributes on page 28, you will find:
Each 
is a navigation link to that element (or attribute if you are in the attribute section) under each of those divisions, Archiving, Publishing, Authoring.
Very cool but falls under “non-obvious” for me.
Pass it on so others can safely and quickly navigate JATS 1.1!
PS: It was Tommie Usdin of Balisage fame who pointed out the table in chapter 7 to me. Thanks Tommie!