<?xml version="1.0" encoding="ISO-8859-1"?>
   <!ELEMENT versioningData (referenceData*)>
   <!ELEMENT referenceData (featureData, bundleData)>
   <!ATTLIST referenceData id ID #REQUIRED>
   <!ELEMENT featureData (entry*)>
   <!ELEMENT bundleData (entry*)>
   <!ELEMENT entry (name, version)>
   <!ELEMENT name (#PCDATA)>
   <!ELEMENT version (#PCDATA)>