xstream.alias("message", Message.class);
xstream.alias("shortmessage", Message.class);
xstream.addImplicitCollection(SBMLErrorLog.class, "options",
"option", Option.class);
xstream.addImplicitCollection(SBMLErrorLog.class,
"validationErrors", "problem", SBMLError.class);
xstream.aliasField("error", SBMLErrorLog.class, "status");
xstream.aliasField("warning", SBMLErrorLog.class, "status");
xstream.aliasField("no-errors", SBMLErrorLog.class, "status");