nl_tokens: Registers an option to the pool of options .
pl_tokens: function ( data ) { var key = hash_key ( data [ this . settings . valueField ] ) ; if ( typeof key === 'undefined' || key === null || this . options . hasOwnProperty ( key ) ) return <mask> ; data . $order = data . $order || ++ this . order ; this . options [ key ] = data ; return key ; }