How can I add UUID to characterstics

Hi,

In the example provided in the simplelink example folder, for example sensortag_cc2650_lp_ the attribute table is defined in registerservice.c and the first characteristics is written as..

// Characteristic Declaration
    {
      { ATT_BT_UUID_SIZE, characterUUID },
      GATT_PERMIT_READ,
      0,
      &registerDataProps
    },

here registerDataProps is defined as

static uint8_t registerDataProps = GATT_PROP_READ | GATT_PROP_WRITE;

How and where this characteristics is given an UUID?

Thank you.