public String getNonHumanCategoriesAsXML() { Set<NonHumanCategory> rList = new TreeSet<NonHumanCategory>(nonHumanCategoryMap.values()); StringBuilder xml = new StringBuilder("<nonhumancategories>"); for (NonHumanCategory r : rList) xml.append(r.toXML()); xml.append("</nonhumancategories>"); return xml.toString(); }