//fixflow扩展流程属性
String category = mainProcess.getCategory();
if(category != null){
propertiesNode.put(PROPERTY_PROCESS_CATEGORY, mainProcess.getCategory());
}
TaskSubjectBehavior taskSubject = mainProcess.getTaskSubject();
if(taskSubject!= null){
propertiesNode.put(PROPERTY_PROCESS_SUBJECT, mainProcess.getTaskSubject().getExpressionValue());
}
FormUri formObj = mainProcess.getFormUriObj();