@Override public DOMImplementation item(int index){
  final int length=getLength();
  if (index >= 0 && index < length) {
    return (DOMImplementation)fImplementations.get(index);
  }
  return null;
}

@ Override public DOMImplementation item ( int index ) { final int length = getLength ( ) ; if ( index >= 0 && index < length ) { return ( DOMImplementation ) fImplementations . get ( index ) ; } return null ; }
returns the indexth item in the collection .
