text: """Common exception classes used by MAEC conversion tools."""
  
  """Indicates a failure caused by a rejected API key."""
  class APIKeyException(Exception):
      pass
  
  """Indicates a failure caused by a rejected API key."""
  class NetworkFailureException(Exception):
      pass
  
  """Indicates a failure caused by a request for a resource unknown to some service.
  (e.g., asking for a report from ThreatExpert by MD5, but the MD5 is unknown to ThreatExpert)"""
  class LookupNotFoundException(Exception):
      pass
  