code: private static IdentifierHandler<? extends Identifier> getExtendedIdentifierHandlerFor(Element element) {
  		if (!checkExtendedIdentityElement(element)) {
  			return null;
  		}
  
  		String name = element.getAttribute(IfmapStrings.IDENTITY_ATTR_NAME);
  
  		Document extendedDocument;
  		try {
  			extendedDocument = DomHelpers.parseEscapedXmlString(name);
  		} catch (UnmarshalException e) {
  			return null;
  		}
  		Element extendedElement = extendedDocument.getDocumentElement();
  		String nodeName = extendedElement.getLocalName();
  
  		// try to find the most specific handler
  		for (Entry<Class<? extends Identifier>, IdentifierHandler<? extends Identifier>> entry : sIdentifierHandlers
  				.entrySet()) {
  
  			String simpleClassName = entry.getKey().getSimpleName();
  
  			if (simpleClassName.equalsIgnoreCase(nodeName)) {
  				return entry.getValue();
  			}
  		}
  
  		return null;
  	}
docs: If the element argument is an extended identity Identifier then try to find the most specific handler for this
  element. Used the Element-LocalName to find the right handler.
  
  @param element
  @return The {@link IdentifierHandler} for the element or null.