class_docstr: Interface for all envelopes.
  Derive from this class, replacing the abstract methods
docstr: The Input Requests and Response are handled here.
docstr_tok: ["The","Input","Requests","and","Response","are","handled","here","."]
code: def handle(self, data, context):
      """
      The Input Requests and Response are handled here.
      """
      self.context = context
      if data:
          data = self.parse_input(data)
  
      results = self._handle_fn(data, context)
  
      if results:
          results = self.format_output(results)
  
      return results
  
imports: from abc import ABC, abstractmethod
label_desc: Use image node_id 2 for calling the BaseEnvelope obj's underlying member method code with example usage: obj.handle(data, context) and returns: results