question: public boolean isInGroup ( VisualItem item , String group ) { if ( ALL_ITEMS . equals ( group ) ) { return true ; } if ( item . getGroup ( ) == group ) { return true ; } TupleSet tset = getGroup ( group ) ; return ( tset == null ? false : tset . containsTuple ( item ) ) ; }
target:  Indicates if a given VisualItem is contained in the given visual data group.