All version 4 specifications have a specific naming convention. This document describes the different parts in that naming convention.
This document describes the details of the version 4 specifications and what the rules are for compliant PDF documents. This document uses plain English language to give the guidelines to which compliant PDF files have to adhere.
Download here (English, pdf) (Final version, correction 1)
Download here (Spanish, pdf) (Final version, correction 1)