public XMLString insert(int offset, String data) {
public final XMLString insert(int offset, String data) {
	public XMLString insert(int offset, String data) {		ensureCapacity(length_ + data.length());		System.arraycopy(value_, offset, value_, offset + data.length(), length_ - offset);		System.arraycopy(data.toCharArray(), 0, value_, offset, data.length());		length_ += data.length();		return this;	}