code: public static Identity createExtendedIdentity(Document doc) throws MarshalException {
  		String idName = DomHelpers.prepareExtendedIdentifier(doc);
  		return createIdentity(IdentityType.other, idName, null,
  				IfmapStrings.OTHER_TYPE_EXTENDED_IDENTIFIER);
  	}
docs: Create an extended {@link Identity} identifier
  with empty administrative domain.
  
  @return the new extended {@link Identity} instance
  @throws TransformerConfigurationException