class_docstr: This class constructs a protocol service class using a service descriptor.
  
  Given a service descriptor, this class constructs a class that represents
  the specified service descriptor. One service builder instance constructs
  exactly one service class. That means all instances of that class share the
  same builder.
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docstr: Initializes an instance of the service class builder.
  
  Args:
    service_descriptor: ServiceDescriptor to use when constructing the
      service class.
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code: def __init__(self, service_descriptor):
      """Initializes an instance of the service class builder.
  
      Args:
        service_descriptor: ServiceDescriptor to use when constructing the
          service class.
      """
      self.descriptor = service_descriptor
  
label_desc: Use image node_id 1 to create a new _ServiceBuilder object from inherited base classes: object with example: obj = _ServiceBuilder(service_descriptor)