ExtGG.thy finished, but more comments are needed.
Theories:
=========
 Max.thy                 Some generic facts about Max.
 Precedence_ord.thy      A theory of precedences.
 Moment.thy              The notion of moment.
 PrioGDef.thy            The formal definition of the PIP-model.
 PrioG.thy               Basic properties of the PIP-model.
 ExtGG.thy               The correctness proof of the PIP-model.
 CpsG.thy                Properties interesting for an implementation.
The repository can be checked using Isabelle 2013-2.
  isabelle build -c -v -d . PIP
Othe directories are:
=====================
  Slides
  Paper
  Journal:     isabelle build -c -v -d . Journal
  Literature
  
Test 3