https://developers.google.com/protocol-buffers/protobuf-java/: Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. 
// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: google/protobuf/empty.proto

package com.google.protobuf;

public interface EmptyOrBuilder extends
    // @@protoc_insertion_point(interface_extends:google.protobuf.Empty)
    com.google.protobuf.MessageOrBuilder {
}