code: public Element append(String name, String value) {
  		Element child = document.createElementNS(XCAL_NS, name);
  		child.setTextContent(value);
  		element.appendChild(child);
  		return child;
  	}
docs: Adds a child element.
  @param name the name of the child element
  @param value the value of the child element.
  @return the created element