What is the format of the CYBLE_GATTC_READ_BY_TYPE_RSP_PARAM_T passed via CYBLE_EVT_GATTC_READ_BY_TYPE_RSP?

I'm using CyBle_GattcDiscoverAllCharacteristics() and decoding the resultant CYBLE_EVT_GATTC_READ_BY_TYPE_RSP (CYBLE_GATTC_READ_BY_TYPE_RSP_PARAM_T* response). The response contains three extra bytes; response->attrData.attrValue[0..2]. Where are they defined, exactly?

For example: https://github.com/cypresssemiconductorco/PSoC-4-BLE/blob/master/100_Pro... contains the following:

    case CYBLE_EVT_GATTC_READ_BY_TYPE_RSP:
        readResponse = (CYBLE_GATTC_READ_BY_TYPE_RSP_PARAM_T *) eventParam;
        if(0 == memcmp((uint8 *)&(readResponse->attrData.attrValue[5]), (uint8 *)uartTxAttrUuid, 16))
        {
            txCharHandle = readResponse->attrData.attrValue[3];
            txCharHandle |= (readResponse->attrData.attrValue[4] << 8);
            infoExchangeState |= TX_ATTR_HANDLE_FOUND;
         }

So readResponse->attrData.attrValue[3:4] is the handle and readResponse->attrData.attrValue[5:20] is the UUID, but what does readResponse->attrData.attrValue[0:2] contain?

Thanks!

Randy