It appears you have to register for an account on that site AND wait for your membership to be approved before you can even download a standard or view documentation.

If that standard is important and well designed, it should be trivial to write a converter from JSON Resume.

As Douglas Crockford once said (I believe in reference to XMLRPC) the great thing about reinventing the wheel is that you might get a round one.

You can download without being a member. There is a Download Standards page that anyone can download from. It's pretty straightforward.

(on the HR Open Standards Board of Directors)

Yep. I'm sure the fantastic exhibition of its fatal flaws will ensue. Maybe. Hopefully.