ByteString Immutable array of bytes.

 CodedInputStream Reads and decodes protocol message fields.

 CodedOutputStream Encodes and writes protocol message fields.

 Extension`2 Represents a type-safe extension identifier used for getting and setting single extension values in instances. This API is experimental and subject to change.

 ExtensionRegistry Provides extensions to messages while parsing. This API is experimental and subject to change.

 ExtensionSet`1 Used for keeping track of extensions in messages. methods route to this set. Most users will not need to use this class directly

 FieldCodec`1 An encode/decode pair for a single field. This effectively encapsulates all the information needed to read or write the field value from/to a coded stream. This class is public and has to be as it is used by generated code, but its public API is very limited - just what the generated code needs to call directly.

 InvalidJsonException Thrown when an attempt is made to parse invalid JSON, e.g. using a non-string property key, or including a redundant comma. Parsing a protocol buffer message represented in JSON using can throw both this exception and depending on the situation. This exception is only thrown for "pure JSON" errors, whereas InvalidProtocolBufferException is thrown when the JSON may be valid in and of itself, but cannot be parsed as a protocol buffer message.

 InvalidProtocolBufferException Thrown when a protocol message being parsed is invalid in some way, e.g. it contains a malformed varint or a negative byte length.

 JsonFormatter Reflection-based converter from messages to JSON.

 JsonParser Reflection-based converter from JSON to messages.

 MessageParser A general message parser, typically used by reflection-based code as all the methods return simple .

 MessageParser`1 A parser for a specific message type.

 RepeatedExtension`2 Represents a type-safe extension identifier used for getting repeated extension values in instances. This API is experimental and subject to change.

 UnknownFieldSet Used to keep track of fields which were seen when parsing a protocol message but whose field numbers or types are unrecognized. This most frequently occurs when new fields are added to a message type and then messages containing those fields are read by old software that was built before the new types were added. Most users will never need to use this class directly.

 ParseContext An opaque struct that represents the current parsing state and is passed along as the parsing proceeds. All the public methods are intended to be invoked only by the generated code, users should never invoke them directly.

 WriteContext An opaque struct that represents the current serialization state and is passed along as the serialization proceeds. All the public methods are intended to be invoked only by the generated code, users should never invoke them directly.

 ExtensionSet Methods for managing s with null checking. Most users will not use this class directly and its API is experimental and subject to change.

 FieldCodec Factory methods for .

 MessageExtensions Extension methods on and .

 ProtoPreconditions Helper methods for throwing exceptions when preconditions are not met.

 UnsafeByteOperations Provides a number of unsafe byte operations to be used by advanced applications with high performance requirements. These methods are referred to as "unsafe" due to the fact that they potentially expose the backing buffer of a to the application.

 WireFormat This class is used internally by the Protocol Buffer Library and generated message implementations. It is public only for the sake of those generated messages. Others should not use this class directly. This class contains constants and helper functions useful for dealing with the Protocol Buffer wire format.

 Extension Represents a non-generic extension definition. This API is experimental and subject to change.

 IBufferMessage Interface for a Protocol Buffers message, supporting parsing from and writing to .

 ICustomDiagnosticMessage A message type that has a custom string format for diagnostic purposes.

 IDeepCloneable`1 Generic interface for a deeply cloneable type.

 IExtendableMessage`1 Generic interface for a Protocol Buffers message containing one or more extensions, where the type parameter is expected to be the same type as the implementation class. This interface is experiemental and is subject to change.

 IMessage Interface for a Protocol Buffers message, supporting basic operations required for serialization.

 IMessage`1 Generic interface for a Protocol Buffers message, where the type parameter is expected to be the same type as the implementation class.