code: public String first(String localName) {
  		for (Element child : children()) {
  			if (localName.equals(child.getLocalName()) && XCAL_NS.equals(child.getNamespaceURI())) {
  				return child.getTextContent();
  			}
  		}
  		return null;
  	}
docs: Gets the value of the first child element with the given name.
  @param localName the name of the element
  @return the element's text or null if not found