old_contents: import arcpy
  
  selected_layer = None
  selected_object = None
  
  # these are the data types we can query.
  allowed_types = ["Point", "MultiPoint"]
  allowed_formats = ['FeatureClass', 'FeatureDataset']
  
  
  # id field, records are unique on this identifier.
  #   FIXME: this is currently hard-coded, needs to reflect the 'ID' 
  #   column chosen during the import process.
  id_field = "Individual_ID"
  
  # default spatialReference id (WGS 84), updated when a layer
  # is selected from the combobox.
  srid = 4326
  sr = arcpy.SpatialReference(srid)
  
  primary_results = None
  
new_contents: import arcpy
  
  selected_layer = None
  selected_object = None
  
  # these are the data types we can query.
  allowed_types = ["Point", "MultiPoint"]
  allowed_formats = ['FeatureClass', 'FeatureDataset']
  
  all_layers = None
  
  # id field, records are unique on this identifier.
  #   FIXME: this is currently hard-coded, needs to reflect the 'ID' 
  #   column chosen during the import process.
  id_field = "Individual_ID"
  
  # default spatialReference id (WGS 84), updated when a layer
  # is selected from the combobox.
  srid = 4326
  sr = arcpy.SpatialReference(srid)
  
  primary_results = None
  
subject: store full layer list in config