public XmlStringBuilder append(Collection<? extends Element> elements) {
for (Element element : elements) {
append(element.toXML());
}
return this;
}
public XmlStringBuilder element(Element element) {
assert element != null;
return append(element.toXML());
}
public XmlStringBuilder optAppend(Element element) {
if (element != null) {
append(element.toXML());
}
return this;
}