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# Field Classes

#### Experimental!

ProtoRPC is an experimental, innovative, and rapidly changing new feature for App Engine. Unfortunately, being on the bleeding edge means that we may make backwards-incompatible changes to ProtoRPC. We will inform the community when this feature is no longer experimental.

The Message class is used to define messages for efficient transmission across network or process space. Messages are defined using field classes.

The following field classes are provided by the `protorpc.messages` module:

class BooleanField()
  Field definition for boolean values.
class BytesField()
  Field definition for string values.
class EnumField()
  See EnumField.
class FloatField()
  Field definition for float values.
class IntegerField()
  Field definition for integer values.
class MessageField()
  See MessageField.
class StringField()
  Field definition for unicode string values.