Client-Protocol-Schema.md

 This page is intended to describe the on-the-wire schema for the new NGDD protocol.
 
-## Overview
+# Overview
 
-The plan is to use Apache Arrow Flight (gRPC + protobuf).
+We're evaluating various protocols
+
+| protocol | description | pros | cons | python | C/C++ | browser | java |
+| ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ |
+| arrow flight | gRPC+protobuf (see below) | nice protocol | heavy library dependencies | yes | yes | poor | ? |
+| HTTP+[JSON] | simple HTTP with some common serialization (e.g. JSON) | very portable | less sophisticated? | yes | yes | yes | yes |
+
+
+## Arrow Flight
+
+One of the protocols we're considering is Apache Arrow Flight (gRPC + protobuf).
 
 The schema will be determined on the fly based on the client request: