code: def layer_title(layer):
      
      exposure_type = layer.keywords['exposure_keywords']['exposure']
      exposure_definitions = definition(exposure_type)
      title = exposure_definitions['layer_legend_title']
      layer.setTitle(title)
      layer.keywords['title'] = title
docs: Set the layer title according to the standards.
  
      :param layer: The layer to style.
      :type layer: QgsVectorLayer