This document defines EPNML 1.1, an XML format used for Petri nets in the web application Petriweb and the Petrinet editor Yasper. EPNML 1.1 is an application of PNML, a developing standard XML format for Petri nets: EPNML 1.1 documents are a particular type of PNML documents. EPNML is modified over time to incorporate corrections and extensions. The version described here is EPNML 1.1, first published in October, 2003; this specification has been modified several times since, due to errors found. At the time of writing we are already considering an updated version of the file format itself, which will be called EPNML 1.2; that slightly modified document format is not described here
