text: """
  Constants
  -----------
  This module provides a central place to define native python enums and
  constants that are used in multiple other modules
  """
  
  import enum
  
  
  class SymbolId(str, enum.Enum):
      """
      Defines the different fields in the symbol dict to which sbml entities
      get parsed to.
  
      .. note:: This class inherits from str enabling direct comparison to
          strings, which means that the species symbols can be accessed as
          symbols['species'], which is convenient for debugging and symbols[
          SymbolId.SPECIES], which is how the field should be accessed
          programmatically.
      """
      SPECIES = 'species'
      PARAMETER = 'parameter'
      FIXED_PARAMETER = 'fixed_parameter'
      OBSERVABLE = 'observable'
      EXPRESSION = 'expression'
      SIGMAY = 'sigmay'
      LLHY = 'llhy'
      EVENT = 'event'
  