question: private TreeElement findDepthFirst ( TreeElement parent , String name ) { int len = parent . getNumChildren ( ) ; for ( int i = 0 ; i < len ; ++ i ) { TreeElement e = parent . getChildAt ( i ) ; if ( name . equals ( e . getName ( ) ) ) { return e ; } else if ( e . getNumChildren ( ) != 0 ) { TreeElement v = findDepthFirst ( e , name ) ; if ( v != null ) return v ; } } return null ; }
target:  Traverse the submission looking for the first matching tag in depth-first order.