parameters: (
      enum_value_descriptor: descriptor.EnumValueDescriptor)
return_statement: return get_value_for_annotation_extension(enum_value_descriptor,
                                              annotations_pb2.source_code_system)
docstring: Returns the value associated with the source_code_system annotation.
  
    Args:
      enum_value_descriptor: An EnumValueDescriptor describing a FHIR Code for
        which to return a source code system.
  
    Returns:
      The string value of the source code system, if one exists. Otherwise,
      returns None.
  
    Raises:
      ValueError: Unable to retrieve options for type: <type>.
docstring_summary: Returns the value associated with the source_code_system annotation.
docstring_tokens: Returns the value associated with the source_code_system annotation .
function: def get_source_code_system(
      enum_value_descriptor: descriptor.EnumValueDescriptor) -> Optional[str]:
    """Returns the value associated with the source_code_system annotation.
  
    Args:
      enum_value_descriptor: An EnumValueDescriptor describing a FHIR Code for
        which to return a source code system.
  
    Returns:
      The string value of the source code system, if one exists. Otherwise,
      returns None.
  
    Raises:
      ValueError: Unable to retrieve options for type: <type>.
    """
    return get_value_for_annotation_extension(enum_value_descriptor,
                                              annotations_pb2.source_code_system)
function_tokens: def get_source_code_system ( enum_value_descriptor : descriptor . EnumValueDescriptor ) -> Optional [ str ] : return get_value_for_annotation_extension ( enum_value_descriptor , annotations_pb2 . source_code_system )