code: function(requestId, itemName) {
  		return protocol.implodeMessage(protocol.timestamp(), dataMethods.END_OF_SNAPSHOT,
  			types.STRING, protocol.encodeString(itemName),
  			types.STRING, requestId);
  	}
docs: Encodes an end of snapshot message for a particular item to be sent to the proxy.
  
  @param {String} requestId the originating request id
  @param {String} itemName the item name
  @return {String} the encoded message
  @private