EPNML 1.1 with subnets - RELAX NG implementation version: $Id: structured.rng 1474 2007-10-18 19:07:36Z rp $ (c) 2003-2004, Technische Universiteit Eindhoven by JMEM van der Werf, jmw@petriweb.org some editing by Reinier Post, rp@petriweb.org human-readable documentation: EPNML 1.1 - an XML format for Petri nets http://www.petriweb.org/specs/epnml-1.1/pnmldef.pdf We use basic EPNML, with some extensions. So we include this document: Unlike in general structured PNML, we do not support reference transitions, and allow referencePlaces only within pages. See [1], section 4 and 8 An EPNML 1.1 page is a "refined transition". It is like a net, except that it is within a net or page, can have reference places, and a transition type. See [1], section 8 A reference place is a placeholder to a place. See [1], section 8.2