question: public B end ( ) { assertCurrent ( ) ; if ( level == 0 ) { throw new IllegalStateException ( logId ( ) + "Unbalanced element hierarchy. Elements stack: " + dumpElements ( ) ) ; } List < ElementInfo > children = new ArrayList < > ( ) ; while ( elements . peek ( ) . level == level ) { children . add ( elements . pop ( ) ) ; } Collections . reverse ( children ) ; if ( ! elements . peek ( ) . container ) { throw new IllegalStateException ( logId ( ) + "Closing element " + elements . peek ( ) . element + " is no container" ) ; } Element closingElement = elements . peek ( ) . element ; for ( ElementInfo child : children ) { closingElement . appendChild ( child . element ) ; } level -- ; return that ( ) ; }
target:  Closes the current container element.