locator

               The locator attribute is used to locate an action 
               within a <Transaction> element.  The value
               of the locator attribute is either a string that
               is equal to the value of the handle attribute
               specified on an  <Insert>, <Update>
               or <Delete> action.  If a value is not 
               specified for the handle attribute then a WFS 
               may employ some other means of locating the 
               action.  For example, the value of the locator
               attribute may be an integer indicating the order
               of the action (i.e. 1=First action, 2=Second action,
               etc.).