op {
  graph_op_name: "ReaderRead"
  visibility: SKIP
  in_arg {
    name: "reader_handle"
    description: <<END
Handle to a Reader.
END
  }
  in_arg {
    name: "queue_handle"
    description: <<END
Handle to a Queue, with string work items.
END
  }
  out_arg {
    name: "key"
    description: <<END
A scalar.
END
  }
  out_arg {
    name: "value"
    description: <<END
A scalar.
END
  }
  summary: "Returns the next record (key, value pair) produced by a Reader."
  description: <<END
Will dequeue from the input queue if necessary (e.g. when the
Reader needs to start reading from a new file since it has finished
with the previous file).
END
}