docs: def execute(self, input_data):
          ''' Execute the ViewPDF worker '''
  
          # Just a small check to make sure we haven't been called on the wrong file type
          if (input_data['meta']['type_tag'] != 'pdf'):
              return {'error': self.__class__.__name__+': called on '+input_data['meta']['type_tag']}
  
          view = {}
          view['strings'] = input_data['strings']['string_list'][:5]
          view.update(input_data['meta'])
          return view