To retrieve items with informations about user logins from collection item-type attribute needs to be added to <retrieve/> element from section 7.2 Retrieving a Collection of XEP-0136 specification with value set to login.
A result will be returned as specified in XEP-0136, but instead of <chat/> element <events/> element will be returned.
Moreover instead of message subelements in <from/> element, there will be custom element containing information about session, ie. <bind/> element with connection resource set as a value. There will be also type attribute added to <from/> element with value set to login to mark that this is login event.
