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. 
public interface com.google.protobuf.ProtocolStringList extends java.util.List<java.lang.String>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.protobuf.ProtocolStringList
  super_class: java.lang.Object
{
  public abstract java.util.List<com.google.protobuf.ByteString> asByteStringList();
    descriptor: ()Ljava/util/List;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/List<Lcom/google/protobuf/ByteString;>;
}
Signature: Ljava/lang/Object;Ljava/util/List<Ljava/lang/String;>;
SourceFile: "ProtocolStringList.java"